Plural-cell duct

ABSTRACT

A plural-cell duct, embedded within a concrete floor, has openings spaced apart along the length thereof; and collars extend upwardly from those openings to help define potential passages extending from the cells of that duct to the surface of that floor. Each of those potential passages has a barrier therein which will effectively isolate one of the cells of that plural-cell duct from an adjacent cell. Whenever a support for an electrical fitting is to be secured to any of those collars, the barrier can be removed from the potential passage through that collar to free substantially the entire cross section of that passage of any -- thereby facilitating the &#39;&#39;&#39;&#39;fishing&#39;&#39;&#39;&#39; of conductors through the plural-cell duct and that collar. Subsequently, a support for an electrical fitting will be secured to the collar; and that support will have a divider which will coact with a partition in the plural-cell duct to restore the isolation of the one cell from the adjacent cell.

Klinkman et a1.

3,751,576 Aug. 7, 1973 PLURAL-CELL DUCT Primary ExaminerBernard A.Gilheany A 1 t E -D. A. T [75] Inventors: Richard A. Klinkman, New fisg, z'; gfig one Baden, 111.; Louis E. Mueller, Fenton, Mo.

[57] ABSTRACT [73] Asslgneez Mac-Fab Products, Inc., St. Louis, M Aplural-cell duct, embedded within a concrete floor, has openings spacedapart along the length thereof; and I [22] A 1972 collars extendupwardly from those openings to help [21] Appl. No; 243,792 definepotential passages extending from the cells of that duct to the surfaceof that floor. Each of those potential passages has a barrier thereinwhich will effec- [52] U.S. Cl. 174/48, 174/5; tively isolate one of thecells of that plurabce" duct [5 n from an adjacent Ce"- whenever asupport for an elec [58] meld Search trical fitting is to be secured toany of those collars, the 52/220 220/3 barrier can be removed from thepotential passage through that collar to free substantially the entirecross [56] References cued section of that passage of any therebyfacilitating the UNITED STATES PATENTS fishing of conductors through theplural-cell duct 3,303,264 2/1967 Saul et a1, 174/48 and that collar.Subsequently, a support for an electri- 3,5l4,525 1970 Flachbarth e! a 9cal fitting will be secured to the collar; and that support have adivider coact a partition in fl g g the plural-cell duct to restore theisolation of the one e1 an 2,931,533 4/1960 Weismann 52/221 x from theadjacent cell 3,023,265 2/1962 Fork 174/57 X 3,417,191 12/1968 Fork 17449 38 34 Drawmg 3,592,956 7/1971 Fork 17 /49 5 3 may 2. I I I [I] I I II I Q D T I o 'l 0 0 3 77 o 73 0 w 6 o, '-/y/ 7'7 '0. 1 a l I I I o 8 f029 g 7 2%,, 5 1 2a Z4 Z6 2 3 2 b- 22 29 6,, o a 0' 0 0 a v provements inplural-cell ducts which are embedded within concrete floors and whichhave collars extending upwardly from openings in the upper surfacesthereof to points which are spaced short distances below the uppersurfaces of those concrete floors.

It is, therefore, an object of the present invention to provide animproved plural-cell duct with collars which can extend upwardly fromopenings in the upper surface thereof to points which are spaced shortdistances below the upper surface of the floor in which that duct willbe embedded.

Where a pluralcell duct is embedded within a concrete floor and isequipped with collars which extend upwardly from openings in the uppersurface of that duct to points which are disposed short distances belowthe surface of that floor, it is necessary to isolate one of the cellsof that plural-cell duct from an adjacent cell. Such isolation will keepfishing" tapes, which are being passed through that one cell, frompassing out of that one cell and into an adjacent cell. It would bepossible to permanently mount a barrier within each of the of suchbarriers is expensive and wasteful of metal. The' present inventionmakes it possible to isolate one of the cells of a plural-cell duct froman adjacent cell, with .minimum cost and minimum usage of metal, and yetmakes it possible to free the central areas of the collars of theplural-cell duct from all obstructions when workmen are fishingconductors through the cells ofthat plural-cell duct; and it does so byproviding a removable barrier within each potential passage extendingupwardly from that plural-cell duct. Until such time as it is removed,each such barrier will effectively isolate one of the cells of theplural-cell duct from an adjacent cell; but once that barrier has beenremoved, it will completely free the central area of the potentialpassage through that collar from all obstructions, and will therebyfacilitate the fishing of conductors through the plural-cell duct. Itis, therefore, an object of the present invention to provide a removablebarrier within each potential passage extending upwardly from aplural-cell duct which can be removed to completely free the center ofthat passage from all obstructions.

In one embodiment of the present invention, the bar- In anotherembodiments of the present invention, the

barrier is made part of the lacking member for-the col- I lar andpluralcell duct; but that barrier can befbroken away from the lockingmember. As'aresult, the locking member of that embodiment performs adual function -removably supporting the barrier and mechanically lockingthe collar to the plural-cell duct. It is, therefore, an object of thepresent invention to provide a barrier which is part of the lockingmember for a collar and plural-cell duct.

' The removable nature of the barrier provided by the present inventionmakes it possible to-use a flush-type rier is removably secured to thepartition within the plural-cell duct; and that barrier can coact withthat partition to effectively isolate one of the cells of thatplural-cell duct from an adjacent cell. However, when that barrier isseparated from that partition, essentially the entire cross section ofthe potential passage to the cells of that plural-cell duct will be freeof obstructions; and hence workmen can work quickly and efiiciently asthey fish conductors through either or both of those cells. It is,therefore, an object of the present invention to provide a barrier whichis removably secured to the partition within a plural-cell duct.

electrical fitting with any of the collars of a plural-cell duct.Specifically, an electrical fitting can be disposed in the space, withina collar, which normally is occupied by a barrier; and hence the uppersurface of that electrical fitting can be set flush with the concretefloor. This is very desirablein locations where an upwardly-projectingelectrical fitting would be objectionable. It is, therefore, an objectof the present invention to provide a flush-type electrical fittingwhich can be disposed in the space, within a collar, which normally isoccupied by a barrier.

The collar provided by the present invention has the lower end thereoftelescoped downwardly through an opening in the upper wall of aplural-cell duct, and then has that lower end flared outwardly to keepany upwardly-directed force, which could be applied to that collar, fromseparating that collar from that plural-cell duct. Abutments whichextend outwardly from the wall of the collar, or cars at the ends of alocking member, overlie the upper wall of the plural-cell duct andprevent any movement of that collar downwardly through the opening inthat upper wall. As a result, to fixedly secure the collar to theplural-cell duct, it is only necessary to provide abutments on the wallof the collar or to provide a locking member, to telescope the lower endof the collar downwardly through the opening in the upper wall of theplural-cell duct until the abutments or the locking member abut thatupper wall, and then flare the lower edge of the collar outwardly intolocking engagement with the under surface of that upper wall. It is,therefore, an object of the present invention to provide a collar for aplural-cell duct which has abutments or a locking member that can abut.the

upper wall of that plural-cell duct to limit downward In the drawing andaccompanying description, several preferred embodiments of the presentinvention are shown and described, but it is to be understood that thedrawing and accompanying description are for the purpose of illustrationonly and do not limit the scope of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawing FIG. 1 is a broken,vertical section through a pluralcell duct, through a collar extendingupwardly from an opening in the upper wall of that duct, and through asupport for an electrical fitting which is secured to that collar,

FIG. 2 is a sectional view through the collar of FIG. 1, and it is'taken along the plane indicated by the line 2-2 in FIG. 1,

FIG. 3 is a partially broken away sectional view through the plural-cellduct, through the collar, and through the support for electrical fittingof FIG. 1, and it is taken along the plane indicated by the line 3-3 inFIG. 1, I

FIG. 4 is a sectional view through the support for electrical fitting ofFIG. 1, and it is taken along the plane indicated by the line 4-4 inFIG. 1,

FIG. 5 is a partially broken away sectional view through the plural-cellduct, through the collar, and through the support for electrical fittingof FIG. l,and it is taken along the plane indicated by the lineS-S inFIG. 1,

FIG. 6 is a vertical section through another and greater-height collarwhich is used with the plural-cell duct of FIG. 1 and which has adivider-equipped closure thereon,

FIG. 7 is a partially broken away sectional view through the collar andclosure of FIG. 6, and it'is taken along the plane indicated by the line7-7 in FIG. 6,

FIG. 8 is a sectional view through a shorter-height collar and adivider-equipped closure therefor,-

FIG. 9 is a sectional. view through the. collar of FIG.

'8, and it is taken along the plane indicated by the line 94 in FIG. 8,

FIG. 10 is a horizontal section through the collar of 7 FIG. 1' beforethe barrier of that collar is removed,

FIG. 11 is a sectional view through the collar of FIG. 1, and it istaken along the plane indicated by the line 11-11 in FIG. 10,

FIG.,l2 is a perspective view of the removable barrier of FIGS. 10 and11,

FIG. 13 is a vertical section through a further pluralcell duct andcollar and support for electrical fitting,

FIG. 14 is a plan view of the collar of FIG. 13 before the-support forelectrical fitting is secured to that collar,

FIG. 15 is a vertical section through a still further plural-cell duct,collar and support for electrical fitting,

FIG. 16 is a sectional view through the plural-cell duct and collar andsupport for electrical fitting of FIG. 15, and it is taken along thebroken plane indicated by the broken line'l6-l6 in FIG. 15,-

' FIG. 17 is a perspective view of the divider which is disposed withinthe collar of FIGS. 15 and 16,

7 FIG. 18 is a partially broken away plan view of a flush-typeelectrical fitting disposed within the collar of FIG. 1,

FIG. 19 is a sectional view through the flush-type electrical fitting ofFIG.'18 and of the collar and pluralcell duct below that flush-typeelectrical fitting, and it is taken along the plane indicated by theline 19-19 in FIG. 18,

FIG. 20 is a sectional view through the flush-type electrical fittingand collar and plural-cell duct of FIG. 19, and it is taken along thebroken plane indicated by the broken line 2020 in FIG. 19,

FIG. 21 is a perspective view of the barrier used in the collar of FIGS.19 and 20,

FIG. 22 is a plan view of another flush-type electrical fitting disposedwithin the collar of FIG. 1, 7

FIG. 23 is a sectional view through the flush-type electrical fitting ofFIG. 22 and through the collar and part of the plural-cell duct belowthat collar, and it is 'taken along the plane indicated by the line23-23 in 23 and 24, and it is taken along the plane indicated by theline 25-25 in FIG. 24,

FIG. 26 is a vertical section through the collar of FIGS. 15 and 16 andthrough a removable U-shaped closure for that collar,

FIG. 27 is a partially broken away plan view of a flush-type-electricalfitting for a collar similar to the collar of FIGS. 13 and 14,

FIG. 28 is a sectional view through the flush-type electrical fitting ofFIG. 27 and through the collar and plural-cell duct below thatflush-type fitting, and it is taken along the plane indicated by theline 2828 in FIG. 27,

FIG. 29 is a sectional view through the flush type electrical fittingand collar of FIG. 28, and it is taken along the broken plane indicatedby the broken line 29-29 in FIG. 28,

FIG. 30 is a sectional view through the flush-type electrical fittingand collar and plural-cell duct-of FIG. 28, and it is taken along theplane indicated by the line 30-30 in FIG. 28,

FIG. 31 is a sectional view through the flushtype DETAILED DESCRIPTIONOF THE PREFERRED EMBODIMENTS Referring particularly to FIGS. l-5 and10-12, the numeral 20 denotes a flat metal plate which has a partition22 that projects upwardly from the upper surface thereof and thatextends along the length of that plate. Asshown particularly by FIG. 1,that partition is formed by a re-entrant bend in that metal plate. Thenumeral 24 denotes an elongated metal plate which has the sides thereofbent downwardly to define a channel, and which has outwardly-directedflanges 26 at the bottoms of those sides. The metal plate 24 defines theside walls and upper wall of a plural-cell duct, and the plate 20defines the bottom wall of that plural-cell duct. The partition 22subdivides that plural-cell duct into two cells; and the left-hand cellcan accommodate the cables or conductors of a telephone system, thecables or conductors of an intercommunication 'system, or the cables orconductors of any other system which is connected to a low-voltagepowersource. The right-hand cell of the plural-cell duct can accommodatethe cables or conductors of a power-supplying system, such as thepower-supplying systems which supply one hundred and ten volts or twohundred and twenty volts' to electrical fittings distributed throughouta building. The outwardly-extending flanges 26 at the-bottoms of thesides of the metal plate 24 will usually be spotwelded equal distances.Each of those circular openings is defined by a frusto-conicalupwardly-directed flange 28 on the plate 24. The lower surface of eachfrustoconical flange 28 isgentlyrounded, as indicated by the numeral 32,to minimize any abrasion of conductors or cables which may be pulledupwardly through the opening defined by that frusto-conical flange. Thenumeral 29 denotes a downwardly-directed offset in the metal plate 24;and that downwardly-directed offset extends along the length of thatmetal plate. That downwardly-directed offset is in register with theupper edge of the partition 22; and itwill coact with that upper edge toisolate the two cells of the plural-cell duct at all points along thelength of the plate 24 which are spaced from the openings defined by thefrusto-conical flange 28 and its counterparts. The numeral 30 denotestwo vetically-directed slots which are formed in the frustoconicalflange 28; and those slots are shown in FIG. 2. The numeral 36 generallydenotesa collar which is circular in' cross section. That collar isformed from sturdy sheet metal, and it preferably is formed by themethod disclosed in application Ser. No. 243,648-for Method Of MakingCollar which was filed by Louis E. Mueller on Apr. 13, I972. Anaxially-directed, circumferentially-extending offset 38 is displacedradially outwardly of the rest of the collar 36 by a shoulder 39; andthat offset is adjacent one edge of the sheet metal blank used in.making that collar, and it overlies the opposite edge of that sheetmetal blank, as shown particularly by FIG. 2. That offset preferably isspotwelded to that opposite edge of that sheet metal blank; and itoverlies and engages a portion of the frustoconical flange 28 on themetal plate 24.

Thenumeral40 denotes a frusto-conical outwardlyand downwardly-directedflange at the lowercdge of the-collar 36;.and, as shown particularly byFIG. 1, that flange underlies and intimately engages the frusto- Yconical flange 28 'on theu'pper'wall'of the metal plate- 24. That frustoconical flange will positively prevent upward movement of the collar36-relativeto the plural-cell duct constituted by the metal plates and24.

Y Asindicated particularly by FIG. 1, a notch 41 is proend of adiameter, of the collar 36, which passes through that offset. Theabutment 42 overlies and engages a portion of the frustmconical flange28 on the metal .plate 24. Consequently, that abutment will coact withthe offset 38to prevent downward movement of the collar 36 relative tothe plural-cell duct constituted by the metal plates 20 and 24.

The numeral 44 denotes vertically-directed slots in the frusto-conicalflange 40 at the lower edge of the collar 36; and those slots arein.register with the slots 30 in the frusto-conical flange 28, a shown byFIG. 2. A generally semi-circular ear 48Iis punched inwardly of the wallof the collar 36, as shown by FIG. 5; and a gen erally semi-circularopening 52 is formed in that wall during the inward punching of thatcar. A verticallydirected opening 56 is provided in the ear 48; and thatopening has one edge thereof immediately adjacent the inner surface ofthe collar 36, as indicated by FIG. 5. The numeral 50 denotes a secondgenerally semicircular ear which is punched inwardly of the wall of thecollar 36; and that ear is at the end of a diameter, of that collar,which passes through the ear 48. A generally semi-circular opening 54 isformed: in the wall of the collar 36 during the inward punching of theear 50. A vertically-directed opening 58 is immediately adjacent theinner surface of the collar 36, as indicated particularly by FIG. 5.

1 FIG. 12 shows a barrier 62 which is generally L- shaped in sideelevation; and that barrier has an ear 64 connected thereto by areduced-height connecting portion 66 and a reduced-thickness portion 68.A second ear 70 is connected .to the opposite side of the barrier 62 bya reduced-height connecting portion 72 and a reduced-thickness portion74. The reduced-height sec tions 66 and 72 are disposed within thealigned slots and 44, respectively, at opposite sides of thefrustoconical flange 28 and of the frusto-conical flange 40. Thereduced-thickness portions 68 and 74 are disposed adjacent the innersurface of the collar 36. The reduced-thickness portions 68 and 74ar'eistrong' enough to maintain the barrier 62 .in assembled relationwith the reduced-height connecting portions 66 and 72 during themanufacture of that barrier, during the assembling of that barrier withthe collar 36, during the assembling of that collar with the plural-cellduct, and during the storage, shipment, and installation of thatplural-cell duct. However, those reduced-thickness portions are madeweak enough so a firm pull, applied downward movement of the collar 36relative to the plural-cell duct constituted by the metal plates 20 and24. Those ears also fill the slots 30'and 44 in the frus'toconicalflanges 28 and 40, respectively and hence those ears mechanically blockrotation of the collar 36 relative to the metal plate 24. As aresult,,'the barrier 62 and the ears 64 and act as a combination barrierand locking member. Even after the barrier 62 has been broken away, theears 64 and 70 will continue to function as locking members. I

The numeral 78 in FIG. 1 1 denotes a cup-like closure which isdimensioned to fit down into the upper end of the collar 36. Thegenerally-cylindrical wall of that cup-like closure will have a pressfit in the upper part of that collar; and hence that closure will notbecome accidentally separated from that collar. Also thatgenerally-cylindrical wall will engage the inner surface of the collar-36 so tightly that essentially no concrete will be able to passdownwardly along the inner surface of that collar. Moreover, thatgenerally-cylindrical wall.

formed in that wall as the ear 48 was formed. The engagement between thegenerally-cylindrical wall of the been fabricated, the connectingportions 66 and 72 of the barrier 62 will be telescoped upwardly intothe slots 44 in the lower edge of that collar. Thereupon, the connectingportions 66 and 72 will be aligned with the slots 30 in thefursto-conical flange 28 on the metal'plate 24,

and the lower edge of the collar =36 will be telescoped downwardlythrough the opening defined by that frusto-conical flange. As theconnecting portions 66 and 72 are telescoped downwardly into the slots30, the outer portions of the lower surfaces of the ears 64 and 70 willengage the upper surface of the metal plate 24. Consequently, the outerportions of those lower surfaces will help prevent movement of thecollar 36 downwardly relative to the metal plate 24. Also,--those outerpor- 8 cell duct have beeninterconnected and set in position, theconcrete of-the floor 79 will be cast. Virtually none duct; because thegenerally-cylindrical portion of the closure 78 tightly engages theinner surface of the-collar 36 and also effectively closes theopenings52 and 54 in'the wall of that collar, and because the jointbetween the frusto-conical flanges 28 and 40 is a tight joint.Additionally, the engagements between the reduced-height connectingportions 66 and 72 and the slots 30 and 44 in the frusto-conical flange28 and 40, respectively, are so intimate that virtually no concrete willbe able to pass through those slots. Although the concrete will beeffectively excluded from the collars '36 and the plural-cell duct, thatconcrete will overlie the tops of those collars and will fill theclosures 78, as indicated particularly by FIG. 11. Moreover, a floorcovering 82, usually in the form of wide sheets or inditions of thoselower surfaces will coact with the lower edges of the offset 38 and ofthe abutment 42 to provide four-point support for the collar 36.

While a suitable die is holding the outer portions of the lower surfacesof the ears 64and 70 solidly in engagement with the upper surface of themetal plate 24, and also is holding the lower surfaces of the offset 38and oflthe abutment 42 against the upper edge of thefrusto-conicalflange 28, a punch will be passed upwardly between theside walls of the metal plate 24 and will cold-flow the lower edge ofthe collar 36 to form the frusto-conical flange 40. Thereafter, thatfrustoconical flange will coact with the engagement between the upperwall of the plate 24 and the ears 64 and 70 and with the engagementbetween the upper edge of the frusto-conical flange 28 and the offset38-and the abutment 42 to mechanically and positively lock the collar 36to that metal plate. At such time, the flanges 26 of the metal plate 24will be welded or otherwise secured to the metal plate; and, thereupon,the upper edgeof the partition 22 will engage the downwardlybent portion29 of the metal plate 24 to effectively isolate the left-hand cell fromthe right-hand cell of the plural-cell duct defined by the metal plates20 and 24.

Where the openings, defined by the frusto-conical 4 flange 28 andsimilar frusto-conical flanges, would tend to place the-two cells of theplural-cell duct in communication with each other via a collar 36, thebarrier 62 will block any such communication, as indicated by FlGall. Inthis way the barrier 62 will coact with the portion of the partition 22adjacent the collar 36 to effectively isolate the two cells of theplural-cell duct formed by the metal plates 20 and 24. The cup-shapedclosure 78 can be pressed into the upper end of the collar 36 before orafter that collar is assembled with the metal plate 24, as desired.

The collar 36 can be made in various heights in the range of 1 Va inchesto 6 inches;.and, preferably, the heights within that range will differby one-eighth of an inch. The particular height selected for any givencollar will be determined by the scheduled thickness of the concretefloor. In practice, the upper edges of the various collars 36 will bespaced about a quarter of an inch below the anticipated level of theupper surface of the concrete floor. Once the various sections of apluralvidual tiles, will overlie the concrete of the floor 79.

After the building of which the floor 79 is a part has been erected, andwhen it is time to install the electrical system, the telephone system,the intercommunication or the control system, a limited number of thecollars 36 will be selected as the collars through which cables orconductors will be brought up through the floor 79. Once those collarshave been selected and located, workment will use cold chisels or othertools to break away the concrete overlying those collars and the closure78 for those collars. The resulting broken-away portions of the floor 79can have the configurations indicated-by the numeral 80 in FIGS. 1, 3and 5.

Once the overlying concrete-has been removed, the workmen will usepunches, screwdrivers, or the like to pierce the closures 78 and to prythose closures out of the upper ends of the collars 36. Thereafter, theworkmen will insert the jaws of pairs of pliers or other toolsdownwardly through the collars to grip the tabs 76 on the barriers 62.Firm upward pulls on those tabs should break the reduced-thicknessportions 68 and 74 to free those barriers. However, if strong upwardpulls do not immediately break those reduced-thickness portions, a fewapplications of upwardly-directed and downwardly-directed forces to thetabs 76 will quickly break those reduced-thickness portions and thereby.free the barriers 62. The ears 64 and will be solidly held by theconcrete of the floor 79; and hence those ears and the reduced-heightconnecting portions 66 and 72-will remain locked in the slots 30 and 44of the frustoconical flanges 28 and 40.

After the barriers 62 have been removed from the collars 36, the entirecentral areas of those collars will be wholly free of obstructions.Consequently, the workmen will find it very easy to fish cables orconductors through either of the cells of the plural-cell duct, and topull those cables or conductors up through the selected collars 36. Asthe fishing" tapes are being passed through those cells, the ends ofthose flshingtapes may tend to rise upwardly and may attempt to entercollars other than the selected collars 36. The ends of those fishingtapes will not be able to move upwardly into those other collars or toride up over the partition 22 and pass into the adjacent-cell, becausethe barriers 62 within those other collars36 will effectively keep thoseends of those flshing" tapes from doing so.

In being located close to the lower end of the collar 36,

the barrier 62 of FIGS. 10-12 avoids the frustrations and delays whichcould occur if the ends of the fishing" were able to rise upwardly intothe intermethreads of that screw will intimately engage themetal of theear-87 and of the ear 50. The overall result .is that the screw 99 willeffectively ground the support'84 to the collar 36, and-thus totheplural-cell duct. The

numeral 101 denotes a similar' screw which extends downwardlythrough theopening in the other car 87 of the support 84 and through the opening 56in the ear duct, and then upwardly through other of the selected collars36. Because the lower surfaces, of the various frusto-conical flanges 28'on the metal plate 24, are gently rounded, as indicated by the numeral32, the cables or conductors will experience little or no abrasion orwearing of the exteriors thereof as they are pulled downwardly andupwardly through theselected collars 36. sufficiently-long lengths ofthe cables or conductors will be permitted to extend beyond the upperends of the selected collars 36 to enable the workmen to make therequired connections to those cables or con ductors.

The numeral84 in FIGS. 1 and 3-5 generally denotes a support for anelectrical fitting; and that support is an outletbox which is secured toa collar 36. A circular opening 86 is provided in the floor 85 of thatsupport; and that opening is in register with the collar 36 and with anopening in the floor covering 82, as indicated particularly by FIG. 1.The opening 86 is circular in plan view; but it has semi-circular ears87 which extend inwardly at opposite ends of a diameter thereof. Thosesemi-circularears will be in register with, and will be similar to, thecars 48 and 50 at the inner surface of the collar 36. Each of the ears87 has a vertically-directed opening therein; and those openingsjare inregister with the openings 56 and 58, respectively, in the ears '48 and50. A resilient gasket 83 is shown intermediate the floor 85 ofthesupport 84 'andthe floor covering 82. That gasket has an openingwhichhas the same configuration as the opening 86 in the floor 85 of thesupport 84; and that gasket'will keep any water which is spilled ormopped onto the floor covering 82 from reaching,

and passing downwardly through, the collar 36.-

The support 84 has a side wall 88 with a narrow slot 90 extendingdownwardly from the upper edge thereof; and that slot has the wallsthereof slightly tapered so the bottom thereof is narrower than the topthereof. A threaded opening 92 is provided in the wall 88, as'indicatedparticularly by FIGS. 1 and 5. The support 84 has a second side wall 94with a slot 96 therein; and the slot 96 is similar to, and is inregister with, the slot 90 in the wall 88, as indicated by FIG. 4. Also,the side wall 94 has a threaded opening 97 therein, as indicated by FIG.5; and that opening is in register with the threaded opening 92. Thenumeral 98 denotes one of the end walls of thesupport 84; and a widenotch 95 extends downwardly from the upper edge of that wall to makethat wall U-shaped in elevation, as indicated by FIG. 5. The numeral 100denotes the opposite end wall of the support 84; and a wide notch 103extends downwardly from the upper edge thereof to make that wall U-shaped in elevation.

A self-tapping screw 99 extends downwardly through the opening in one ofthe ears 87 and through the opening 58 in the ear 50 on the collar 36.Because one edge of the opening 58 is immediately adjacent the innersurface of the collar 36, the thread of that self-tapping screw willbiteinto the inner surface of that collar. The head of that self-tappingscrew will be tightened down into intimate engagement with the car .87;and the 48. The thread of that screw will bite into the inner surface ofthe collar 36, the head of that screw will intimately engage the car 87,and the thread of that screw will intimately engage the metal of the ear87 and of the ear 48. Consequently, the screw 101 also will effectivelygroundkthe support 84 to the collar. 36, and thus to the plural-cellduct By enabling both of the screws 99 and. 101 to effectively groundthe support 84 to the collar .36, thepresent invention provides a doublefactor of safety for the grounding'of that support. v

The numeral. 102 generally denotes the stationary part of a dividerwhich has a vertically-directed portion and a horizontally-directedportion, as shown particularly by FIG. l. Wings-l06 and 108 extendoutwardly beyond the oppositesides of the stationarypartl02 of thedivider, as shown particularly by FIG. 3; and the wing 106 has the lowerportion of the outer edge thereof disposed within the slot in the wall88 of the support 84, while the wing 108 has the lower portion of theouter edge thereof disposed within the slot 96 in the wall 94 of thatsupport-The thicknesses of the wings 106 and 108 are less than thewidths of the upper portions of the slots 90 and 96 in the walls 88 and94, respectively, of the support 84; but those thicknesses equal orslightly exceed the widths of the lower ends ofthose slots.Consequently, as the stationary part 102 of the divider has those wingspressed downwardly into those" slots, that stationary part will ,beeffectively ',grounded to the support 84; and, because that support iseffectively grounded to the plural-cell duct by means of the collar 36and screws 99 and 101, that sta .tionary part also is effectivelygrounded to that plural-cell duct. The numeral 110 denotes a movablepart of the divider; and that movable part has an elongatedvertically-directed slotflllZ-therein. Screws 114 extend through theslot 112 and seat within openings in the Sta-- tionary part 102 of thedivider, as indicated particularly by FIG. 1. Those screws aredimensioned so the heads thereof will be spaced far enough from theadjacent surface of the stationary part 102 of the divider to permit themovable part 110 to freely slide up and down relative to that stationarypart.

As the wings-106 and 108 of the stationary part of the divider aretelescoped downwardly into the slots 90 and 96, respectively, in thewalls 88 and 94 of the support 84, the lower end of that stationarypart-will approach theleft-hand side of the partition 22 in theplural-cell duct. Simultaneously, the lower edge of the movable part 110of that divider will move downwardly into env gagement with the upperedge of the partition 22; and

the final position of that movable part relative to that stationary partwill be determined by the engagement of the-lower'edge of that movablepart with the upper edge of the partition 22. The collar 36 shown inFIGS. l-5 is short in height; and, in one preferred embodiment of thepresent invention, that collar has a total height of l /8 inches. As aresult, the lower edge of the 1 stationary part 102 of the divider lapsthe upper edge of the partition 22 in the plural-cell duct. However,with wardly to engage the upper edge of the partition 22. Eye wbsn...acollar 6.,wh hhasan vs alt he of 6 inches is used, the lower edge of themovable part 110 will be able to engage and-rest upon the upper edge ofthe partition 22. In this way, the stationary part 102 and the movablepart 110 of the divider are able to coact with the partition 22 torestore the isolation, of the two cells of the plural-cell duct, whichwas initially provided by the barrier 62, and which wasjnterr uptedbythe removal of that barrier.

The nlimeral l 16 denotes a metal plate which prefer-- ably hasafinished outer surface and which has notches 118 and 120 extendingdownwardly from the upper edge thereof, as indicated particularly byFIGS; 4 and 5. A grommet 122 of generally-rectangular configuration isdisposed within the notch 120; and it has the grooves in three of theedges thereof telescoped over the portions of the plate 1 16 whichdenine the sides and bottom of the notch 120. A similar grommet 124 isdisposed within the notch 118; and the grooves in three of the edges ofthat grommet telescope over the portions of the plate 116 which definethe sides and bottom of the notch 118. Those grommets are provided withreduced-thickness central portions which can be readily broken away toenable cables and conductors of different diameters to pass throughthose grommets. Screws 126 extend through openings in the plate 116 toseat in openings in the wall 98 of the support 84, as indicated by FIG.4. The numeral 128 denotes a duplex outlet receptacle; and screws 130extend through openings at the outer ends of that receptacle and seatwithin openings in thewall 100 of the support 84, as shown by FIG. 4. Acover plate 132, which preferably has an attractive outer surface, isprovided for the duplex outlet receptacle 128; and a screw 134 extendsthrough an opening in that cover plate to secure that cover plate inposition adjacent that duplex outlet receptacle. The grommets 122 and124 and the duplex outlet receptacle 128 are standard and usualelectrical items which are available on the market. v

The numeral 136 denotes a metal cover that has a horizontally-directedupper portion, and that has downwardly-extending side portions whichmake that cover resemble an inverted U in end elevation. Screws 138extend through countersunk openings in the side portions of that coverand seat in the openings 92 and 97, respectively, in the side walls 88and 94 of the support 84 to releasably secure that cover tothat-support. The cover 136 will coact with the plate 116 that supportsthe grommets 122'and 124, and with the cover plate 132 for the duplexoutlet receptacle 128, to completely enclose the top, sides and ends ofthe support 84. The stationary part 102 of the divider coacts with thesupport 84 and with the cover 136 to isolate the portions of thatsupport and cover which accommodate the duplex outlet receptacle 128,from the portions of that support and cover which accommodate thegrommets 122 and 124. Further, as indicated by FIG. 1, thehorizontally-directed portion of the stationary part 102 overlies theduplex outlet receptacle 128; and, in doing so, thathorizontallydirected portion will protect a workman, who is installingor working on low voltage cables or conductors, from inadvertentlytouching an electrically-live component. Consequently, as long as thestationary part102ofthe-divider is in the posi-. tion shown by FIG. 1,it performs the dual function of a divider and of a shield.

Whenever a workman wishes to install or to work on the duplex outletreceptacle 128, or on any conductor connected to that duplex outletreceptacle, he will remove the stationary and movable parts 102 and 110of the divider by raising the wings 106 and 108 of that stationary partupwardly out of the slots 90 and 96, respectively, in the side walls 88and 94 of the support 84. Once the workman has completed his work on theduplex outlet receptacle, or on the conductors connected thereto, heneed only reinsert thelower portions of the wings 106 and 108 within theslots 90 and 96, respectively, in the sidewalls 88 and 94 of the support84.

As shown particularly by FIGS. 10 and 11, the sum of the radius of thebarrier 62 and of the height of the vertically-directed portion of thatbarrier is less than the height of the collar 36. Further, as shown byFIG. 10, the horizontally-directed portion of that barrier is generallysemi-circular; and hence considerably less metal is needed to make thatcollar than would be needed to make a diametrical divider which wasvertically-directed and which had a height equal to that of the collar36. With collars 36 which have heights greater than I /8 inches, thesavings in metal which the barriers 62 afford are even greater; and,therefore, it should be apparent that the present invention makes itpossible to isolate the cells of a plural-cell duct with less metal thanwould be required if those cells were isolated by vertically-directeddiametrical dividers within the collars 36. Further, because the barrier62 is assembled with the collar 36 merely by inserting the reducedheightconnecting portions 66 and 72 into the slots 44 in the collar 36, itshould be apparent that it is easier and less expensive to assemble thatbarrier with that collar than it would be to use screws to secure avertically-directed diametrical divider to a collar. Moreover, becausethe ears 64 and help position and secure the collar 36 of FIGS. 1-5relative to the pluralcell duct, the use of the barrier 62 reduces theoverall cost of locking that collar to that plural-cell duct.

In view of the fact that the barrier 62 is completely removed from thecollar 36 of FIGS. 1-5, when the reduced-thickness portions 68 and 74are broken away, the vertically-directed portion of the stationary part102 of the divider has to be made longer than it would be if that collarwas equipped with a permanentlyinstalled vertically-directed,diametrical divider. However, because only about one of every tencollars is actually used to permit conductors to pass upwardly throughthe floor 79, only about oneof every ten collars 36 will have a dividertherein. The overall result is that by using the barrier 62 of thepresent invention, instead of using a permanently-installed,verticallydirected diametrical divider within the collar 36, substantialsavings in metal and cost can be effected.

Referring particularly to FIGS. 6 and 7, the numeral 142 denotes acollar which is identical to the collar 36 of FIGS. 1-5 in all respectsother than its length. The

.collar 142 has a height which is greater than the height of the colar36; and that collar is used with a floor 143 which is thicker than theflpor 79 of FIGS. 1, 3 and 5. The collar 142 is a coliar which at onetime had a support 84 for electrical fittings connected to it, and whichI had cables or conductors extending upwardly through which extenddownwardly through the openings 56 and 58, respectively, in the ears 48and 50 on that collar.

An L-shaped plate 146 hasthe horizontally-directed portion thereofsec'ured'to the under surface ojf'the cover 144 by spot welds, and thevertically-directed portion of that plate extends downwardly toward theupper ,edge of the partition 22 within the plural-cell duct. The numeral147,. denotes a plate which has a vertically-directed slot 150 therein;and that plate is held in face-to-face relation with the verticallydirected portion of the plate 146 by screws 149 which extend throughthat slot and seat in openings in that verticallydirected portion. Thosescrews are dimensioned so the plate 147 can respond to its own weight tomove downwardly into engagement with the upper edge of the partition 22.Where the collar 142 is relatively short in height, thevertically-directed portion of the plate -146 willlap the upper portionof the partition 22, as shown by FIGS. 6 and However, where'that collaris taller, the movable plate 147 will move downwardly below the loweredge of the vertically-directed portion of the plate. 146 to engage theupper edge of the partition 22. In this way, the plate 146, by itself orwith the aid of the movable plate 147, will coact with the partition 22to restore the isolation, between the cells of the plural-cell .duct,which'was eliminated when the barrier 62 that was originally mountedwithin the collar 142 was broken away and removed. Theplates 146 and 147thus act as dividers, and thereby makeit a simple matter to re-establishthe isolation between the cells of a pluralcell duct even after theoriginally-provided barrier has been removed; A resilient gasket 145 isshown between thecover 144 and-a floor covering 151. v

Referring particularlyto FIGS. 8 and 9 thenumeral 152 denotes acollarwhich resembles the collar 36 of FIGS. l-5; but that collar isshorter than the collar 36, and it does, not have slots in thefrusto-conical flange40 thereof. The collar l52 has abutments. 154 and156 which are similar in form to the abutment 42 and which overlieandengagetheupper edgeof the frusto-conical flange 28 on the metal plate24 of the plural-cell duct.

, Thoseabutments will coact with the abutment 42 and the offset 38toprovide four points of engagement between the collar 152 and the upperedge of the frusto-conical flange 28; and those points of engagementwill coact with the frusto c'onicaI flange 40 on the lower edge ofcollar 152 to solidly hold thatcollar in position relative to' the upperwall of the metal plate 24.0f the plural-cell duct.

vBecause it does not have slotsin the frusto-conical flange 40thereof,the collar 152 couldnot be equipped with the barrier 62 of FIGS.1] and l2. I-Iowever, that collar could be equipped with a cup-shapedclosure, such as the cup-shaped closure 78 of FIG. 11, if thatcup-shaped closure was equipped with a divider. For. example, if thecup-shaped closure 78 was equipped with an integrally-formed dividerasis .the cupshaped closure of FIG. 26 that closure could be used toinitially close the upper end of the collar 152. After that cup-shapedclosure and its divider were removed 14 from the upper portion of thecollar 152, a support for electrical fitting, such as the support 84 ofFIGS. 1, 3

and 5, could be secured to that :collar. If that support I forelectrical fitting was subsequently separatedv from the collar 152, theisolation, which the dividerof'that support for electrical fittingprovided between the cells of the plural-cell duct, could bere-established byadivider which is secured to, and which dependsdownwardly from, the under surface of a cover 158. That cover is similarto the cover 144 of FIGS. 6 and 7; and screws 162 extend downwardlythrough that cover and seat in the openings 56 and 58, respectively, inthe cars 48 and 50 to secure that cover to-thecollar 152. The divider160 is L-shaped in side elevation; and the lower end of thevertically-directed portion thereof will abut one side of the partition22 in the plural-cell duct, and thus will isolate the two cells of thatpluralcell duct from each other. A" gasket 163 can be provided betweenthe cover l58'and the floor covering 164, as shown by FIG. 8, to keepwater which is spilled or mopped onto that floor covering from enteringthe collar 152. 7 i

. The collar 152 is particularly desireable where the plural-cell ductis to be incorporated into. ajreduced thickness concrete floor; becausethat collar can be made with a total height of as little asseven-eighthsof an inch. That collar could, of course, be made taller,and thus could be used in concrete floors of greater thickness. However,for concrete floors which have thicknesses great enough to permit itsuse, the collar 36 is preferred; because the barrier 62 and the ears 64and 7 0 thereon perform the combinedfunctions of barrier and of lockingmember. If the collar 152 were to be made so tall that the bottom of anintegrally-formed divider on a cup-shaped closure therefor could notabout the upper edge of the partition 22, a cup-shaped closure like thecup-shaped closure 78 of FIG. I I could be equipped with an L-shapeddivider such asthe divider 160 of FIGS. 8 and 9, Such a closure couldeffectively coact with the partition 22 to isolate the cells of theplural-cell duct. 4 1

Referring particularly to FIGS. 13 and .14, the numetal 166 denotes ametal plate whichhas two reentrant bends that define partitions 168 and170. Those thereof bent downwardly to define a channekand ,out vwardly-directed flanges 174 are provided at the lower ends of thosesides. Those flanges will be suitably secured to the plate 166, as byspot welds, to define a plural-cell duct. The metal plate 172 has anupwardly and inwardly inclined flange 176 at the top thereof whichdefines an opening that has parallel sides and concave ends. Thejunction between the plate 172 andthe upwardly and inwardly inclinedflange 176 has the under surface thereof smoothly rounded, as at 178, tominimize abrasion of the insulation on any cables or conductors whichare passedthrough the opening defined by that upwardly and inwardlyinclined flange. The numerals 180 and 182 denote downwardly-bentportions of the metal plate 172; and the downwardly-bent portion 180 isin register with and engages the upper edge of the partition 168, whilethe downwardly-bent por tion 182 is in register with and engages theupper edge of the partition 170. The downwardly-bent portion 180coacts'with the partition 168 to effectively isolatethe except where theupwardly and inwardly inclined flange 176 and similar upwardly andinwardly inclined flanges define openingsin themetal plate 172.

The plural-cell duct of FIGS. 13 and 14 differs from the plural-cellduct of FIGS. 1 5 in that it has three parallel cells whereas the latterplural-cell duct has just two cells. Also, the plural-cell duct of FIGS.l-S has circular openings which are defined by the frustoconical flange28 and by similar frusto-conical flanges, not shown, whereas theplural-cell duct of FIGS. 13 and 14 has openings with parallel sides andconcave ends which are defined by upwardly and inwardly inclinedflanges.

The numeral 186 generally denotes a collar which is made from two piecesof sheet metal; and one of those pieces of sheet metal has an offset 188which overlaps,

and is spotwelded to, one end of the other piece of sheet metal. Thatother piece of sheet metal has an offset 190 which overlaps, and isspotwelded to, the opposite end of the first piece of sheet metal. Theoffsets 188 and 190 extend downwardly from the upper edge of the collar186 to points which are spaced short distances from the lower edge ofthat collar. The collar 186 has abutments 192 and 194 which resemble theabutment 42 on the collar 36 of FIGS. l-5. As shown particularly by FIG.14, the offsets 188 and 190 are located at the approximate centers ofthe ends of the collar 186, and the abutments 192 and 194 are located atthe approximate centers of the sides of that collar. The-offsets 188 and190 and the abutments 192 and 194 will rest upon the upperedge of theupwardly and inwardly inclined flange 176 whenever the lower end of thatcollar is fully seated within the opening defined by that flange. Thelower edge of the collar 186 has a downwardly and outwardly inclinedflange 196'which abuts and underlies the upwardly and inwardly inclinedflange 176 on the metal plate 172. The abutments 192 and 194 and theoffsets 188 and 190 will hold the collar 186 against movement downwardlyrelative to the metal plate 172, while the downwardly and outwardlyinclined flange 196 will prevent upward movement of that collar relativeto that plate. As a result, the collar 186 will be solidly secured tothe plate 172.

The numeral 198 denotes an ear which is punched inwardly of one wall ofthe collar 186, and that ear has a vertically-directed opening 200therein. One edge of that opening is immediately adjacent the innersurface of the collar 186, so the thread of a screw which is passeddownwardly through that opwning will bite into the inner face of thewall of that collar. The ear 198 is generally semi-circular in planview, and it is punched out of a generally semi-circular opening 202 inthe wall of the collar 186. The numeral 204 denotes a similar ear whichhas a similar opening 206 therein, and which is punched out of asemi-circular opening 208 in the wall of the collar 186. The numeral 210denotes an ear which is in register with the ear 198; and that car has avertically-directed opening 212 therein. The numeral 214 denotes an earwhich is in register with the ear 204, and it has a vertically-directedopening 216 therein. As

indicated particularly by FIG. 14, the ears 198 and 210 are disposed ashort distance to the right of the parti: tion 168, and the ears 204 and214 are disposed a short distance to the left of the partition 170.

The numeral 218 denotes a short, vertically-directed slot which isformed in the downwardly and outwardly directed flange 196 at the loweredge of the collar 186; and that slot is similar to either of the slots44 of the collar 36 of FIGS. 1-5. A similar slot, not shown, is providedin the opposite side of the downwardlyand outwardly-directed flange 196on the collar 186. Those slots accommodate connecting portions 223 whichinitially connect a barrier 220, shown by dotted lines in FIG. 13, tocars 222 that are disposed outwardly of the upwardly and inwardlyinclined flange 176 on the metal plate 172. The connecting portions 223can be essentially identical to the connecting portions 66 and 72 on thebarrier 62 of FIG. 12; and the ears 222 can be essentially identical tothe ears 64 and on the barrier 62. The barrier 220 will be L-shaped, andthus will resemble the barrier 62- of FIG. 12 in end view; but thebarrier 220 will have a configuration which is comple-- mentary to thespace between thepartition and the right-hand end of the collar 186. Atab 224 extends upwardlyfrom the free edge of the barrier 220; and thattab can be gripped to separate that barrier from the connecting portions223. Reduced-thickness portions, not shown, which are comparable to thereducedthickness portions 68 and 74 on the barrier 62 of FIG. 12, willbe provided between the barrier 220 and the connecting portions 223.

The numeral 226 denotes a concrete floor in which the plural-cell duct,the collar 186, and the ears 222 are solidly embedded. The numeral 228denotes brokenaway portions of the floor 226 which are above the levelof, and generally in register with, the collar 186. Initially, thatcollar had a closure therefor which was cup-shaped and which was pressedtightly down into the upper portion of that collar. The side wall ofthat cup-shaped closure blocked the openings 202 and 208,

and also blocked the corresponding openings from which the ears 210 and214 were punched. As a result, that cup-shaped closure kept virtuallyall of the concrete of the floor 226 from leaking into the collar 186through the upper portion of that collar. The engagement between thedownwardlyand outwardly-directed flange 196 at the lower edge of thecollar 186 and the upwardly and inwardly directed flange 176 issufficiently intimate to keep concrete from passing therebetween. Afloor covering 229, which can be in the form of wide sheets orindividual tiles, overlies the concrete floor 226; and that floorcovering has an opening therein in register with the collar 186.

The numeral 230 generally denotes a support for electrical fitting whichas an opening 234 in the bottom 232 thereof; and that support is shownas an outlet box. That opening will be slightly larger than, but willclosely resemble, the opening defined by the upper end of the collar186. Bars 245, one of which is shown in FIG. 13, extend inwardly of theopening 234; and those ears have openings therein which are in registerwith the openings 206 and 216, respectively, in the ears 204 and 214 onthe collar 186. A gasket 233 is disposed between the bottom 232 and thefloor covering 229 for the concrete floor 226.

The numeral 236 denotes one of the side walls of the support 230, andthat side wall has a slot 238 which extends downwardly from the upperedge thereof. The upper end of that slot is slightly wider than thelower end of that slot, as indicated by FIG. 13. A threaded opening 240is provided in the side wall 236, and that opening is disposed to theleft of the slot 238, as shown by FIG. 13. The support230 has theoppositeside wall thereof, not shown,-formed as a mirror image of theside wall 236; andthe threaded opening in that opposite side wall isin'register with the threaded opening 240, and the slot in thatopposileside wall is in register with the slot 238. The numeral 242denotes one of the end walls of the support 230, and that end wall has awide notch, not shown, which extends downwardly from the upper edgethereof to make that end wall substantially U-shaped. The end wall 242can be similar, or even essentially identical, to the end wall 98 of thesupport 84 of FIGS. 1-5. The numeral 244 denotes the opposite end wallof the support 230; and that end wall has a wide notch, not shown, inthe upper edge thereof which extends downwardly to maketh at end wallsubstantially U-shaped. The end wall 244 can be similar, or evenessentially identical to, the end wall 100 of the support 84 of FIGS.1-5.

A self-tapping metal screw-246 extends downwardly through an opening inthe car 245 on the support 230, and then-through the opening 206 of theear 204 on the collar 186. The thread of that screw will bite into theinner surface of the collar 186 as well as into the metal of the ears245 and 204; and the head of that screw will firmly abut the uppersurface of the ear 245. As a result, that screw will effectively groundthe support 230 to the collar 186; and that collar is efiectivelygrounded to the plural-cell duct by-the flanges 176 and 196,respectively, on the metal plate 172 and on that collar. In. this way,the support 230 will be grounded to that plural-cell duct. A similarselftapping metal screw, not shown, will extend downwardly through anopening in an car, not shown, which is comparable to the ear 245 andthen through the opening 2l6'in theearv 214 on the collar 186. Thatscrew will effectively ground the support 230 to the collar 186; and;because that collar is 'efi'ectively grounded to the plural-cell duct,that screw will effectively ground the support 230 to that plural-cellduct. Because both the screw 246 and its conterpart effectively groundthe support 230 to the plural-cell duct, those screws-provide a doublesafety factor in the grounding of that support.

The numeral 248 denotes the stationary part of a divider which haswings, not shown, that can be identical to the wings 106 and 108 of thestationary part 102 of the divider of FIGS. l-5 The lower portions ofthe outer edges of those wings will be lodged within the slot 238 in theside wall 236 and within the corresponding slot, not shown, in theopposite side wall of the support 230. The stationary part 248 has ahorizontally extending upper portion which overlies the area between theend wall 244 and the slot 238 and its counterpart slot. The numeral 252denotes a verticallydirected movable part of the divider which has avertically-directed slot, not shown, therein. That movable part can besimilar to the movable part 110 of FIGS. l-5; and thevertically-directed slot in the movable part 252 can be identical to thevertically-directed slot in the movable part 110. Screws 254 extendthrough the the divider. Those screws hold the movable part 252 inassembled relation with the stationary part 248-of the divider, but theypermit that movable part to move upwardly and downwardly relative tothat stationary part. The numeral 256-denotes a plate which hasafinished outer surface and whichhas grommets 258 supported withinnotches that extend downwardly from the upper edge thereof. Screws 260extendthrough countersunk openings ,in that plate and seat in tappedopenings within the end wall 242 of the support 230. The plate 256 andthe grommets 258 can be similar, or even essentially identical, to theplate ll6.and the grommets 122 and 124 of FIGS. 1-5. If desired, theplate 256 can be equipped with three grommets, rather than with just thetwo grommets of FIGS. 1-5. The numeral 262 denotes a duplex outletreceptacle which has the strap thereof secured to the end wall 244 ofthe support 230 by screws 264. A cover plate 266 for that duplex outletreceptacle is secured to that duplex outlet receptacle by a screw, notshown. The numeral 268 denotes a metal cover which is similar to thecover 136 of FIGS. 1-5. A screw 270 extendsthrough a countersunkopeningin one wall of that'cover and is seated within the opening 240 inthe side wall 236 of the support 232. A similar screw, not shown,extends-through a similar countersunk opening in the opposite side wallof that cover and seats in a similar tapped opening in the opposite sidewall of the support 230. When the plural-cell duct of FIGS. 13 and 14 isset in position within the form for the concrete floor 226, each of thecollars 186 will have a barrier 220 therein and each of those barrierswill effectively isolate the right-hand cell from the middle andleft-hand cells. Also, each of those collars will have a cup-likeclosure, not shown, pressed into the upper end thereof to keep concretefrom entering the upper end of that collar when the floor 226 is cast.The side wall of that cup-like closure will efi'ectively close theopenings 202 and 208 and their counterparts in the opposite side wall ofthe collar 186. Consequently, virtually no concrete will be able toenter the collar 186.

After the building, of which the concrete floor 226 is a part, has beenerected, and when the various cables or conductors are to be installed,the cup-like closure, not shown, of the selected'collars 186 willbeguncovered by breaking away the thin layer of concrete thereabove.Those closures can then be removed by forcing vertically-directed slotin the movable part 252 and seat in threaded openings in the stationarypart 248 of a cold chisel, the blade of a screwdriver, or the likedownwardly through the central portions thereof, and then applyingprying forces to that cold chisel, screwdriver or the like. Once acup-like closure has been removed, a pair of pliers or some otherinstrument can be inserted into the collar 186 to apply firm pulls tothe tab 224 on the barrier 220. When the reducedthickness portionsbetween that barrier and the connecting portions 223 have been brokenaway, that barrier will be removed; and then the support 230 will besolidly secured to the collar 186 by the screw 246-and its counterpart.

If conductors of the power-supplying system are to be fished, thestationary part 248 of the divider will be removed from its positionwithin the support 230 and the collar 186. Thereafter, thosepower-supplying con-- ductors can be fished through the right-hand cellof the plural-cell, duct, and can be pulled upwardly through theright-hand end of the collar-186 and through the right-hand end of thesupport 230. After the bared ends of those conductors have been suitablyheld by the binding screws of the duplex outletreceptacle 262, thestationary part 248 of the divider can be set in position so thehorizontally-directed portion thereof will overlie and shield theelectrically-live portions of that duplex outlet receptacle. As the earsof the stationary part 248 of the divider are pressed downwardly intothe slot 238 and into its counterpart, the movable part 252 of thatdivider will engage the upper edge of the partition 170 and will assumethe position shown by FIG. 13.

If, on the other hand, cables or conductors of a lowvoltage system areto be fished, the stationary part 248 of the divider will be left inposition within the support 230 and the collar 186. That stationary partand the movalbe part 252 will coact to effectively isolate the middleand left-hand cells of the plural-cell duct from the right-hand cell.Also, that stationary part and that movable part will coact to keepaworkmans hand from. accidentally coming into contact with anelectrically-live portion of the duplex outlet receptacle 262.

Referring particularly to FIGS. 15-17, the numeral 272 denotes the upperwall of a plural-cell metal duct;

and the numeral 274 denotes a collarwhich extends upwardly from theupper surface of that wall to define an opening. Preferably, that collaris formed by a drawing operation, so it can be a homogeneous part of thewall 272 and so there will be no line of cleavage between that collarand that wall. Because of the cost and difficulty of making deep-drawncollars, the wall 272 and the collar 274 will usually be restrictedtoinstallations where the collar is less than one inch high. The numeral276 denotes one of the side walls ofth plural-cell metal duct; and apartition 278, which is located between that side wall and another sidewall, not

, shown, subdivides that plural-cell duct into a plurality of elongatedparallel cells.

The numeral 280 denotes concrete which is formed around the collar 274and which overlies the upper wall 272 of the plural-cell duct; and thatconcrete will usually be part of the floor of a building. The numeral282 denotes broken portions of the concrete immediately adjacent theupper edge of the collar 274; and the numeral 284 denotes a floorcovering forthe concrete 280. That floor covering can be in the form ofa continuous sheet or in the form of a number of individual tiles; andit has an opening therein which is in register with the collar 274. Aresilient gasket 286 is provided adjacent the opening in the floorcovering 284, as shown particularly by FIGS. 15 and 16.

At the time the plural-cell duct is shipped to a building site, each ofthe collars 274 thereof will have a closure therein. Those closures willhave dividers secured to, or made integral with, them; and thosedividers will coact with the partition 278 to effectively isolate theadjacent cells of the plural-cell duct from each other. Those closurescould resemble the cup-shaped closure 7 8 of FIG. I l, but would have adivider such as the divider 160 of FIGS. 8 and 9 secured to the webthereof; or those closures could be like the closure of FIG. 26. In anyevent, those closures would be set within the collars 274 to keepconcrete from entering those collars.

The numeral 288 generally denotes a divider which is approximatelyrectangular in elevation; and that divider can be installed in anycollar 274 from which the closure has been removed. That divider has avertical-- ly-directed groove-defining bent portion 290 adjacent one endthereof, and it has a similar vertically-directed groove-defining bentportion 292 adjacent the opposite end thereof. A short punched-outlength 294 of the bent portion 290 coacts with the rest of that bentportion to define a vertically-directed opening 298; and a shortpunched-out length 296 of the bent portion 292 coacts with the rest ofthat bent portion to define a vertically-directed opening 300. Theopenings 298 and 300 are large enough to accommodate the lower ends ofself-tapping metal screws 319. A limited-height wing 302 projectsoutwardly beyond the bent portion 290, and a similar wing 304 projectsoutwardly beyond the bent portion 292. An ear 306 is bent outwardly anddownwardly from one side of the divider 288 so the downwardly-bentportion of that ear is laterally displaced from a plane which is definedby the wings 302 and 304. The lateral displacement of the ear 306 fromthat plane is approximately equal to the width of the partition 278 inthe plural-cell duct.

The distance between the outermost edges of the bent portions 290 and292 is slightly less than the inner diameter of the collar 274, asindicated by FIG. 15. However, the distance between the outermost edgesof the wings 302 and 304 is considerably greater than that innerdiameter; and hence those wings can underlie, and extend outwardly of,the portions of the upper wall 272 of the plural-cell duct whichsurround the opening defined bythe collar 274. When the wings 302 and304 underlie the upper wall 272 of the plural cell duct, they willprevent any upward separating movement of the divider 288 from thatplural-cellduct. Moreover, when the divider 288 is in the position shownby FIGS. 15 and 16, the wings 302 and 304 are disposed at one face ofthe partition 278 while the downwardly-directed portion of the car 306is disposed at the opposite face of that partition; and hence thosewings will coact with that ear to hold 'that divider in alignment withthat partition, and thereby enable that divider to act as an extensionof that partition. Furthermore, the outermost edges of the bent portions290 and 292 will confront the inner surface of the collar 274, and willthereby limit the extent to which the-divider 288 can be shiftedlongitudinally of the partition 278. The overall result is that when thedivider 288 is in the position shown by FIGS. 15 and 16, that dividerwill act as an extension of the partition 278 and will coact with thatpartition to effectively isolate the two elongated cells of theplural-cell duct. i

To install the divider 288 within the collar 274, that divider will betilted so a line which extends between the wings 302 and 304 willincline downwardly from upper right to lowerleft in FIG. 15; and thenthat divider will be moved downwardly through the collar 274 and intothe left-hand cell of the plural-cell duct, as that plural-cell duct isviewed in FIG. 16. After all portions of that divider have been moveddownwardly into that cell and below the level of the collar 274, thatdivider will be rotated about the line which extends between the wings302 and 304 and, thereupon, the plane upper edge of the partition 278,and that divider will be shifted axially of that partition until theoutermost edges of the bent portions 290 and 292 thereof are both 21located inwardly of the opening defined by the collar 274. At suchtimefthe divider 288 can .be rotated, about the line which extendsthrough the wings 302 and 304', until it assumes the position shown byFIGS. and 16. As that divider isso. rotated, the upper edges of thewings 302 and 304 will engage the under face of the wall 272 of theplural-cell duct; and that engage ment will'prevent removal of thatdivider upwardly through the opening defined by the collar '274', andalso will cause the car 306 to successively move over, and thendownwardly below the level of, the upper edge of the partition 278. Whenthe divider 288 reaches the position shown by FIGS. 15 and 16, the ear306 will'be at one side of the partition 278 while the wings 302 and 304will be at the opposite side of that partition, and

the upper edges of'those wings will be immediately adjacent the underface of the wall 272 of the plural-cell duct. Consequently, that dividerwill be fixedly held against accidental separation from the plural-cellduct or the collar 274.

If it ever becomesdesirable to remove the divider 288 from the collar274' as when the cables and conductors within that collar are to beremoved that divider can be rotated in the counterclockwise direction inFIG. 16, about the-upper edge of the partition 278, until that dividerreaches a horizontalposition. At such time,"the ear 306 will have beenrotated upwardly and out of engagement with that partition, and thefaces of the wings 302 and 304 will be spaced away from that partition.Although those wings will still be underlying the portions of the Iwall272 of the plural-cell duct which surround the opening defined by thecollar 274,

and thus will prevent upwardly-directed separating movement of thedivider 288 from the collar 274, that divider can .be shiftedlongitudinally of the partition 278 until one of those'wings movesinto'register with that opening. Thereupon, the divider 288 can betilted upwardly and then withdrawn through the collar 274.

The numeral 308 denotesa support for an electrical fitting; and thatsupport has upwardly-directed side walls 310 and upwardly-directedU-shaped end walls 312. The side walls 310 can be similar to thesidewalls 88 and 94 of the support 84 of FIGS. 1 and 3 5; and theupeardly-directed U-shaped end walls 312 can be similar to the end walls98 and 100 of'that support. The support 308 has a generally-circularopening 314 in the bottom thereof; and that opening is in. register withthe opening in the gasket 286, and also"with= the opening defined by thecollar 274, as shown particularly by FIG. 16. Ears 315 are provided atopposite sides of the opening 314; and those ears have openings 316therein to accommodate the screws 319. The openings 316 are in registerwith the openings 298 and 300 defined by .the barrier 288, as shown byFIG. 15. The numeral 318 denotes openings in the side walls 310 of thesupport 308, and one of those openings is shown in FIG. 16.

The shanks of the self-tapping metal screws 319 extend into the openings298 and 300 defined by the divider 288; and the threads of those screwswill bite into the adjacent surfaces of the portions 290. and 294, andalso into the adjacent surfaces of the bent portion 292 and 296, tofixedly secure the support 308 to the divider 288. As those screws aretightened, the upper 'to the plural-cell duct and to the floor covering284.

The gasket 286. will engage the bottom of the support 308 as well as thefloor covering 284, and-thus will keep any water, which is spilled ormopped onto the floor,

'can be identical to the receptacle-receiving plate 132 in FIGS. 1, 4and 5. Screws 327 extend through openings in the plate 326 and seat inopenings in the righthand end wall 312- in FIG. 16.

The numeral 330 generally denotes a divider which has ahorizontally-directed portion 332, and which has an offset 334 in thevertically-directed portion thereof. That offset disposes the lowermostportion 336 of the divider 330 at the left-hand side of the divider 288in FIG. 16. Wings 339 on the divider 330 have the lower portions of theouter edges thereof lodged within tapered slots 341 in the upstandingside walls 310 of the support 308 for electrical fitting. Those portionsof those outer edges will be wedged downwardly into the slots 341 tofixedly hold the divider 330 against tilting or accidental separationfrom the support 308. As indicated particularly by FIG. 16, the divider330 coacts with the partition 278 and the divider 288 to isolate theright-hand cell of the plural-cell metal duct and the right-handportions of the collar 274 and of the support 308 from the left-handcell in that plural-cell duct and from the left-hand portions of thecollar274 and of the support 308.

The numeral 340 denotes an inverted U-shaped metal cover which has'thesides thereof telescoped downwardly over the outer edges of the plates320 and 326, and over the outer faces of the side walls 310. Screws 342extend through countersunk openings in the side walls of the invertedU-shaped cover 340, and are seated'in the openings 318 in the side walls310. That inverted U-shaped cover can be identical to the invertedU-shaped cover 136 in FIGS. 1 and 3-5.

- Referring particularly to FIGS. 18-21, the numeral 344 generallydenotes a barrier which can be used in the collar 36 of FIGS. 1-5, 10and 11. That barrier has a generally-plane, horizontally-directedportion which is pentagonal in plan view, and which has the sidesthereof dimensioned to fit within the space defined by the collar 36. Aflange 348 extends downwardly from one edge of that barrier, as shownvparticularly by. FIG. 21; and an car 346 is bent downwardly adjacentthat flange. The outer face of the car 346 and the inner face of theflange 348 are spaced apart a distance which is comparable to thethickness of the partition 22 of the plural-cell metal duct. As aresult, that-ear and that flange can abut opposite faces of thepartition 22, as shown particularly by FIG. 19, and thus can hold thatbarrier fixedly in position on that partition. A tab 350 extendsupwardly from the opposite edge of the barrier 344; andthat tab can beused to install or to remove that barrier from its position within thecollar 36.

As indicated particularly by FIG. 19, the frustoconical flange 40 at thelower edge of the collar36 has a slot 46 therein; and that slotaccommodates one of the reduced-height connecting portions 66 and 72 oftion 22 of the plural-cell metal duct to provide initial isolation ofthe two elongated cells of that plural-cell met'al duct. However, afterthat barrier was broken away from those reduced-height connectingportions, full and complete access to the central portion of the collar36 was had; and conductors 361 were fished" through the right-handelongated cell shown in FIG. 19.

The bared ends of those conductors were connected to the terminals of asingle outlet receptacle 360 which has two prong-receiving slots plus aslot for a grounding pin, as shown by FIG. 18. A strap 358, which issecured to and supports the receptacle 360, is secured to the undersurface of a support for electrical fitting which is generally denotedby the numeral 352. Screws 362 extend upwardly through openings in theends of that strap and seat in openings in that support. As shownparticularly by FIG. 18, the support 352 has a circular periphery buthas a generally-oblong opening 356 therein. As indicated by FIGS. 19 and20, the support 352 has a shallow annular recess 354; and, as indicatedby FIG. 20, it has openings therein which accommodate self-tapping metalscrews 99. Those screws extend downwardly through openings in the ears48 and 50 at the inner surface of the collar 36, as shown particularlyby FIG. 20; and, when those screws are tightened, they v will press theunder surface of the periphery of the support 352 solidly against thefloor covering 351 which overlies the concrete floor 79. The shallowannular recess 354 in the "upper surface of the support 325 accommodatesa cover plate 364; and that cover plate has a relatively-large threadedopening 366 therein which can accommodate a standard and usual threadedplug. That plug will overlie and protect the single outlet receptacle360 whenever that outlet receptacle is not being used. Screws 368 extenddownwardly through openings in the cover plate,364 to seat in openingsin the support 352. t

The barrier 62, which'is shown in FIG. 12, will be installed within thecollar 36 of FIGS. 19 and 20 at the time the plural-cell duct is shippedfrom the factory,

and that barrier will effectively coact with the partition 22 to isolatethe elongated cells of that elongated plural-cell duct. Until such timeas the collar 36 of FIGS.

' closure, not shown, in the collar 36 will be removed,

and then the barrier 62 will be broken away and removed from thatcollar.

After the barrier 62 has been broken away and removed from the collar36, but before the conductors 361 are fished," the barrier 344 will beset in position to overlie the exposed portion of the left-handelongated cell of the plural-cell duct. That barrier will then coactwith the partition 22 to maintain the isolation of the elongated cellsof that plural-cell duct. The conductors 361 will thenbe fished throughthe right-hand elongated cell, and will have the bared ends thereofmoved outwardly of the collar 36 and secured to the terminals of thesingle outlet receptacle 360. Thereafter, the screws 99 will be passeddownwardly through the openings in the ears 48 and 50 at the innersurface of the collar 36, and then those screws will be tightened tosolidly secure the support 352 against the floor covering 351. Finally,the cover plate 356 will beset within the shallow annular recess 354,and will then be held in that recess by the screws 368.

Referring particularly to FIGS. 22-25, the numeral 370 denotes a strapwhich has the same dimensions as the'strap 358 in FIGS. 18-20; and thatstrap can be secured to the under surface of the support 352 'forelectrical fitting by screws 376. As shown particularly by FIG. 25, thestrap 370 has a slot 372 therein, and that slot accommodates a generallyU-shaped grommet 374. The numeral 378 denotes a cover plate which has acircular opening 380 therein, and that opening accommodates a grommet382. That grommet can accommodate a cable 386 such as a telephone cableor the cable of an intercommunication system. Screws 384 are usable tosecure the cover plate 378 within the shallow annular recess 354 in theupper surface of the support 352 for electrical fitting.

When the elongated plural-cell duct of FIG. 23 is shipped to a buildingsite, it will have the collar 36, together with other similar collars,not shown, secured to it; and each of those collars will have a barrier62 therein and will have the upper end thereof blocked by a closure,such as the closure 78 of FIG. 1 l. The barriers 62 will coact with thepartition 22 to maintain effective isolation of the elongated cells ofthe elongated plural-cell duct from each other.

Whenever it is desirable to pass the cable 386 through the collar 36shown in FIGS. 23 and 24', an opening will be cut in the floor-covering351, the concrete which overlies the upper end of that collar will bebroken away, the U-shaped closure will be removed, and then the cable386 will be fished through the left-hand elongated cell of the elongatedplural-cell duct. The barrier 62 will not be disturbed; and hence itwill continue to coact with the partition 22 to effectively isolate theelongated cells of the elongated plural-cell duct from each other. Thismeans that the cable 386 can be fished without any risk of itgettinginto the elongated cell in which power-supplying conductors havebeen, or will be, fished for connection to outlet receptacles adjacentother collars 3 6, not shown.

Once the cable 386 has been fished" through the collar 36, the free endof that cable will be passed upwardly through the opening 356 in thesupport 352; and that free end will be moved through'that opening untila suitable length of that cable projects beyond that opening. Thereupon,the portion of the cable 386 adjacent the grommet 374 will be pressedinto position within the open end of that grommet; and, thereafter, thatgrommet will help resist shifting of that cable relative to the support352. The free end of the cable 386 will then be telescoped through thegrommet 382 which is carried by the cover plate 378; and then that coverplate will have the periphery thereof seated within the shallow, annularrecess 354 in the upper surface of the support 352. At such time, thescrews 384 can be used'to holdthat cover plate in position within thatshallow circular recess.

Ordinarily a gasket will not be required between the support 352 and thefloor covering 351. However, if such a gasket were ever needed, it couldbe readily sup- 'partit'ion 27 8 to isolate the ipl'ulal 'cell duet.

The closure 3 90 will be provided betwee the generally-cylindrical porthat closure and the inner surface of that collar; be' ea'u'se such alit willkeep virtually "concrete from entering the "upper end of thatcollar. The cup-shaped closure 390 also hasja 'generally-plane web whichwill effectively seal the upper'endof the collar 274; and

thatwebhas a divider 392 ellte'ndingdownwardly from the jlower facethereof.j That "divider preferably is formed by a" drawiiig"operation;and that divider is a chord of thefcircltz'defintgd by the collar-274.More'- indicated. by Flo; 26. I

.ovenithellol'ver surface ofthe'divider 392*is convex; as

as he U-shaped closure' 390 willperform the dual function ofkeeping theconcrete 280' from entering' the collar 274 wherlfthat concrete ispoured", and also of serving as "an upward exterlsiori ofthep'artition27 8 to coactwith that partition to effectively isolate thetwo elongated cells of the plural-celliduct.Consequently, whenelectrical conductors are passedi thro ugh the elongated cell of t hatplural-cell duct, those conductors will be kept from entering theelongated ileft -hand celliof that plural-cell duct. However, wheneverasupport 308 for an electrical fitting: is to be [seed to the collar 274shown in FIG. 26, t th n layer ofconcrete,which overlies the upper end of the lcollar 27 4 andlalso overlies the generallyecylindricalportionof;the cl osure;390,-will be broken away and that cup- ;shap edclosurewill beremoved. At such time, a divider 288 can be disposed within thecollar 274, in the mannerdescribed hereinbefore; and that dividercanthen perform the function which, the divider 392 performed :while thecup-shapedclosure 390 was inposition within ;the collar v274. Thedivider 288 will, of course, perform the additional function of actingas a securing means fforthe screws23l9, and thus for the-support 308i 8:The cup-shaped closure 390 of FlG.v26 is a very useful, butve'ryinexpensive component of the overall plu- -ral=cell duct That closurecan be punched and drawn from sheet m'etal and thus can be made quiteinexpen- 'or' assem bling operations. Further, that-,closureisjinstalled 'sim'pl'y'bypressing itdown into position within aic'olla'r274; and, once it has been set in position, that 'cldsure will performthe dualfuntions of excluding. all foreign materialand' ofserving as anextension of the elongaged. cells within-the i r is shownin FIG 26 as itappears when installed within acollar' 274. That collar also "couldbeinstalled within the collar 152 ofFlGS; s and orwithin] any othershort-height collar; The primary r edliirementof any-collar in which theclosure 390 is a use'd is that it beshort enough to enable the divider392 that closure to closely approach theupper edgelof thepartitionwithin the plural-cellduct.-

, 4l8;whieh extend vtovtheleftfrom the upper en 1 arms 418adjacent,thatevertic ally-directed formed; 1' and those opening's,are:-cornparab 1 are provided in; the ears mary difference between the collar39 4;in ElGS;

cell duct;'and that concretetwill initially fo.

e The numeral 416 generally w t -Referring particularly to ,FIGS. '2Z 2,.the nurneral 39.4, generally denotes a :collar which is silrlil'ar tocollar gl86 in FIGSl -IJand 14. The-collar 324 has an offset 396 at oneend-thereof which -is eomparable to the offset 188 in FIGS; l 3';ar 1c1'14-, and it has an offs egt 398 at the opposite end thereof whichiscomparable to wardly and-downwardly inclined flange 399 at: I loweredge thereof: which vis; comparable v to the utlar 5186. Furtherthe-collar; 394, will have abutme theiwall of-the collar 394, as theeargttl gt e an 0pening412; is formed in that wallas th ear openings 202and 208-in FIG. l3.:Qpenings,,n

those openings are; comparable to; theopenings 212; 2063!!(13216,respectively in-ElQ 14 The riand the;collar-,-18ti in nos, 13 ar; is thel g' n of .those collars, the collar being shown was; being shorter'thanthe, collar 186,

l Thetcolla'r -394 is secured ,to an elongated pl i duct which can beidenticaltotthe; elongated plural; l duct shown in, FIGS, '13 andlMwTheoutwardl downwardly inclined flange 39 9 2911 the colla abuts,-and isdisposed inwardly of, theupvva ltdly an n- :wardly inclined-flange176.That collarnl la t lungic'ell duct will be locked together bya(:Qllfltjrbtirig portionsmot shown, which are comparable to theconnecting portions223 in H0. 14, Whengthe collar@814. and theplural-cell duct'are shipped to'abuilding site that collar willbe'equipped-with a. barrie r,'-not h as the barrier 220 of FIG. 13. l el I The numeral 400 in FIGS. 287-32.denotesconerete which surrounds thecollar 394 and o verlie s,;the pl li ralfr l that collarand a cup-shapedclosure therefor vv \Zl /l enever -lit is desirable tomountelectricalfittings adjacentth'e lar 394, an opening will be cut in; the -floorcovering 435; and .then the section vof the. concrete flolor o er lyingthe collar-394 will be broken away to form the broken away portions,402,.After the cupeshapedl l sure has been removed, the barrierwhichsisble to the barrier 220 inFlQ-l S willbejb and removed. 7 -j isshown in plan view in FIG; 31 and is s (I avertical; section in FlC 28.Asshown by I bracket has I spaced-apart horizontally-directed armsvertically directed portion; and the portions o arms which areimmediately adjacent rthatitvertlcallydirectedeportion are widenedforstiffening purposes by inclined sections.-; Openings. 420 are provided;in)

- further openings not-sho wn, .are, provided In hose armsadjacent thefreeendsof those arms. The b 416 has a shelf 422twhich ext ends' to theleft twin he lower edge of the verticallyrdirected .portion,

bracket 416; and that shelf has a pa'lrofwide extending inwardly fromthe opposite sides thereof, and has a pair of narrow slots 426 extendinginwardly from those sides. An L-shaped extension 428 has thevertically-directed portion thereof secured to the verticallydirectedportion of the bracket 416 by a screw 430; and it has thehorizontally'directed portion thereof overlying the upper edge of thepartition 170 in the plural-cell duct.

- The arms 418 of the bracket 416 overlie the upper edges of the sidesof the collar 394, as indicated particularly by FIGS. 28,30 and 31; andscrews 442 extend downwardly through the openings, not shown, adjacentthe free ends of those arms and pass through the openings in the ears404 and 408 to fixedly secure that bracket to that collar. A slot 429 inthe vertical portion of the L-shaped extension ,428 accommodates theshank of the screw 430, and that slot and screw will permit the positionof that L-shaped extension to be adjusted relative to the position ofthe bracket 416. In this way, the bracket 416 and its L-shaped extension428 can be used with collars of different heights. After the arms 418 ofthe bracket 416 have been fixedly secured to the collar 394, the screw430 will be loosened; and the horizontally-directed portion of theL-shaped extension 428 will be moved downwardly into engagement with, orin close proximity to, the partition 170, and then the screw 430 will bere-tightened. Grommets 432, which have slits in the outer ends thereof,are disposed within the wide slots 424 in the shelf 422 of the bracket416. One of those grommets is shown in FIG. 31, the other of thosegrommets is shown in FIGS. 27 and 28, and both of those grommets areshown in FIG.

29. That other grommet was omitted from FIG. 31 to make it possible toshow the configuration of the slot therefor by solid lines. Grommets434, which have slits in the outer ends thereof, are disposed within thenarrow slots 426 in the shelf 422 of the bracket 416. One of thosegrommets is shown in FIG. 31, while the other of those grommets is shownin FIGS. 28 and 29. That other grommet 434 was omitted from' FIG. 31 tomake it possible to show the configuration of the slot 426 therefor bysolid lines.

The numeral 436 denotes a support for electrical fitting; and thatsupport is generally oblong in plan, as indicated by FIG. 27. -A shallowgenerally-oblong recess 438 is formed in the upper surface of thatsupport, and that recess is disposed between the outer periphery of thatsupport and a generally-oblong opening 440 which extends through thatsupport, as shown by FIGS. 27 and 28. Screws 444 extend downwardlythrough openings at the midpoints of the sides of the support 436 andpass through the openings 420 in the arms 418 of the bracket 416; andthose screws fixedly'secure the support 436 to the bracket 416, and holdthe periphery of that support in intimate engagement with the floorcovering 435. Ordinarily a gasket is not required between the support436 and the floor covering 435; but, if a gasket should be desired, itcould easily be disposed between the lower surface of that support andthe upper surface of that floor covering before the screws 444 are usedto secure that support in position. The numeral 446 denotes a strapwhich supports duplex outlet receptacle 448; and the outer ends of thatstr'ap overlie the upper edge of the collar 394, as indicated by FIGS.31 and 32. Screws 450 extend downwardly through openings in the outerends of the strap 446 to seat in the openings in the ears 410 and 414,as

indicated particularly by FIGS. 31 and 32. As a result, those screws canfixedly secure that duplex outlet receptacle to the collar 394. v

The numeral 452 denotes a cover plate which is generally-oblong in plan,and that cover plate is dimensioned to fit down into thegenerally-oblong shallow recess 438 in the upper surface of the support436. That cover plate has openings 454 therein adjacent the lefthand endthereof, and it has threaded openings 456 therein adjacent theright-hand end thereof, all as shown by FIGS. 27 and 28. The openings454 accommodate grommets 458; and one of those grommets is shown in FIG.27, while the other of those grommets is shown in FIG.28. That othergrommet was not shown in FIG. 27 to make it possible to show theconfiguration of the slot 454 therefor by solid lines.

When it is desirable to mount electrical fittings adjacent the collar394, an opening will be formed in the floor covering 435, and theconcrete which overlies that collar will be broken away, as describedhereinbefore. Also, the barrier, which is similar to the barrier 220 inFIG. 13, will be broken away. Thereafter, cables 460 and 462 can befished through the left-hand elongated cell shown in FIG. 28, and thefree ends of those cables can be passed upwardly through the collar 394.Also, a smaller cable 464 can be fished" through the middle elongatedcell shown in FIG. 28, and the free end of that cable can be passedupwardly through the collar 394. The cables 460 and 462 will be forcedthrough the slits in the grommets 432 until they are encircled andconfined by those grommets. The smaller cable 464 will be forced throughthe slit in the grommet 434 at the right-hand side of FIG. 29 until itis encircled and confined by that grommet. If desired, a further smallconductor 464 could be fished, and then could be forced through the slitin the other grommet 434.

Once the cables 460, 462 and 464 have been suitably disposed within thepassages through the grommets 432 and 434, screws 442 will be used tofixedly secure the bracket 416 to the collar 394. At such time, thescrew 430 will be loosened so the horizontally-directed portion of theL-shaped'extension 428 can be moved down into engagement with, orimmediately adjacent to, the partition in the plural-cell duct.

Thereafter, conductors 466 will be fished" through the right-handelongated cell of the plural-cell duct of FIG. 28 and will be passedupwardly through the collar 394. At this time, the bracket 416 willcoact with its L- shaped extension 428 and with the partition 170 toeffectively isolate the right-hand portion of the collar 394 from theportions of that collar in which the cables 460, 462 and 464 arelocated. In this way, the free ends of the conductors 466 willautomatically be guided upwardly and away from the left-hand and middleelongated cells of the plural-cell duct of FIG. 28. The ends of theconductors 466 will be bared and will be suitably secured to theterminals on the duplex outlet receptacle 448; and then the strap 446,which supports that duplex outlet receptacle, will be secured to thecollar 394 by the screws 450. At such time, the cover plate 452, and thegrommets 458 within the slots 454 therein, will be moved adjacent theends of the cables 460, 462 and 464; and then the end of the cable 460will be passed through the left-hand grommet 458 in FIG. 29, and theends of the cables 462 and 464 will be passed through the right-handgrommet 458. Thereupon, the cover plate 436 will be slid along thelengths of the cables

1. An enclosure, for electrical conductors, which can be embedded withina portion of a building and which comprises an elongated metal duct, anelongated partition within said elongated metal duct which subdividesthe interior of said elongated metal duct into a plurality of elongatedcells, said elongated partition being angularly displaced from the planeof one wall of said elongated metal duct and having one edge thereofadjacent to said one wall, an opening in said one wall of said elongatedmetal duct which exposes a portion of said one edge of said elongatedpartition and also exposes adjacent portions of said elongated cells, acollar surrounding said opening and extending away from said one wall ofsaid elongated metal duct, said collar coacting with said opening todefine a potential passage which has portions thereof located withinsaid adjacent portions of said elongated cells and which extends throughsaid collar, and a barrier which is disposed within said passage andwhich occupies part of but less than all of a given cross section ofsaid passAge and which coacts with said elongated partition within saidelongated metal duct to isolate one of said elongated cells from theother of said elongated cells, said barrier also effectively blockingaccess from the upper end of said collar to that portion of saidpotential passage which is located within one of said elongated cells,whereby said barrier effectively prevents access to said one of saidelongated cells from a point above the upper end of said collar to apoint within said one of said elongated cells, said barrier beingremovable from said passage without any fracturing of the wall of saidcollar and being bodily and cleanly removable from said passage to freesaid cross section of said passage from all obstructions, and therebyprovide full and unobstructed access to said adjacent portions of saidelongated cells via said collar.
 2. An enclosure for electricalconductors as claimed in claim 1 wherein said one wall of said elongatedmetal duct has an upwardly-inclined flange that surrounds said openingand that extends outwardly from said one wall of said elongated metalduct and away from said elongated partition, wherein said collar has adownwardly-inclined flange at that end thereof which is adjacent saidone wall of said elongated metal duct, wherein said downwardly-inclinedflange on said collar abuts said upwardly-inclined flange on said onewall of said elongated metal duct, wherein a locking element which is inaddition to said collar engages both said collar and said one wall ofsaid elongated metal duct to mechanically prevent movement of saidcollar inwardly of said opening in said one wall of said elongated metalduct, and wherein said locking element coacts with said collar and withsaid one wall of said elongated metal duct to mechanically andpositively prevent circumferential movement of said collar relative tosaid one wall of said elongated metal duct.
 3. An enclosure forelectrical conductors as claimed in claim 1 wherein said one wall ofsaid elongated metal duct has an upwardly-inclined flange that surroundssaid opening and that extends outwardly from said one wall of saidelongated metal duct and away from said elongated partition, whereinsaid collar has a downwardly-inclined flange at that end thereof whichis adjacent said one wall of said elongated metal duct, wherein saiddownwardly-inclined flange on said collar extends outwardly and awayfrom said end of said collar, wherein said downwardly-inclined flange onsaid collar is disposed inwardly of and abuts the inner surface of saidupwardly-inclined flange on said one wall of said elongated metal ductto mechanically prevent separating movement of said collar away fromsaid one wall of said elongated metal duct, wherein a locking elementwhich is in addition to said collar engages both said collar and saidone wall of said elongated metal duct to mechanically prevent movementof said collar inwardly of said opening in said one wall of saidelongated metal duct, whereby said collar is mechanically locked againstmovement relative to said one wall of said elongated metal duct, andwherein said locking element coacts with said collar and with said onewall of said elongated metal duct to mechanically and positively preventcircumferential movement of said collar relative to said one wall ofsaid elongated metal duct.
 4. An enclosure for electrical conductors asclaimed in claim 1 wherein said barrier has a portion thereof which isdisplaced laterally from said elongated partition in said elongatedmetal duct and which extends upwardly and which can be grasped to enableforces to be applied to said barrier which will remove said barrier fromsaid passage to provide full and unobstructed access to said adjacentportions of said elongated cells via said collar.
 5. An enclosure forelectrical conductors as claimed in claim 1 wherein readily-frangiblemeans releasably hold said barrier in said passage, and wherein saidreadily-frangible means can be broken by forces exerted on said barrierthrough the upper end of said collar to permit removal of said barrierfrom said passage.
 6. An enclosure, for electrical conductors, which canbe embedded within concrete and which comprises an elongated metal duct,an elongated partition within said elongated metal duct which subdividesthe interior of said elongated metal duct into a plurality of elongatedcells, said elongated partition being angularly displaced from the planeof one wall of said elongated metal duct and having one edge thereofadjacent to said one wall, an opening in said one wall of said elongatedmetal duct which exposes a portion of said one edge of said elongatedpartition and also exposes adjacent portions of said elongated cells, acollar surrounding said opening and extending away from said one wall ofsaid elongated metal duct, said collar coacting with said opening todefine a potential passage which has portions thereof located withinsaid adjacent portions of said elongated cells and which extends throughsaid collar, and a closure which is removably disposed within saidcollar and which removably occupies substantially all of a given crosssection of said collar and which overlies said adjacent portions of saidelongated cells to keep said concrete from entering and blocking saidadjacent portions of said elongated cells, said closure normallycoacting with said elongated partition within said elongated metal ductto isolate one of said elongated cells from the other of said elongatedcells, said closure being bodily and cleanly removable from said collarand from said passage without any fracturing of the wall of said collarto free said passage from all obstructions, said collar being acold-formed portion of said one wall of said elongated metal duct sosaid collar and said one wall of said elongated metal duct are integralparts of the same piece of metal, whereby the combination of said collarand said one wall of said elongated metal duct is completely devoid ofany line of cleavage between said collar and said one wall of saidelongated metal duct.
 7. An enclosure, for electrical conductors, whichcan be embedded within a portion of a building and which comprises anelongated metal duct, an elongated partition within said elongated metalduct which subdivides the interior of said elongated metal duct into aplurality of elongated cells, said elongated partition being angularlydisplaced from the plane of one wall of said elongated metal duct andhaving one edge thereof adjacent to said one wall, an opening in saidone wall of said elongated metal duct which exposes a portion of saidone edge of said elongated partition and also exposes adjacent portionsof said elongated cells, a collar surrounding said opening and extendingaway from said one wall of said elongated metal duct, said collarcoacting with said opening to define a potential passage which hasportions thereof located within said adjacent portions of said elongatedcells and which extends through said collar, a barrier which is disposedwithin said passage and which occupies at least a part of the crosssection of said passage and which coacts with said elongated partitionwithin said elongated metal duct to isolate one of said elongated cellsfrom the other of said elongated cells, said barrier also effectivelyblocking access from the upper end of said collar to that portion ofsaid potential passage which is located within one of said elongatedcells, whereby said barrier effectively prevents access to said one ofsaid elongated cells from a point above the upper end of said collar toa point within said one of said elongated cells, said barrier beingremovable from said passage without any fracturing of the wall of saidcollar and being bodily and cleanly removable from said passage to freesaid cross section of said passage from all obstructions, and therebyprovide full and unobstructed access to said adjacent portions of saidelongated cells via said collar, said one wall of said elongated metalduct having an upwardly-inclined flange that surrounds said opening andthat extends outwardly from said one wall of said elongated metal ductand away from said elongated partition, said collar having adownwardly-inclined flange at that end thereof which is adjacent saidone wall of said elongated metal duct, said downwardly-inclined flangeon said collar abutting said upwardly-inclined flange on said one wallof said elongated metal duct, a locking element engaging said collar andextending outwardly from said collar to be embedded within said portionof said building to prevent peripheral shifting of said collar relativeto said portion of said building or said one wall of said elongatedmetal duct, and said barrier being part of said locking element butbeing capable of being broken away from said locking element to freesaid cross section of said passage from all obstructions.
 8. Anenclosure, for electrical conductors, which can be embedded within aportion of a building which comprises an elongated metal duct, anelongated partition within said elongated metal duct which subdividesthe interior of said elongated metal duct into a plurality of elongatedcells, said elongated partition being angularly displaced from the planeof one wall of said elongated metal duct and having one edge thereofadjacent to said one wall, an opening in said one wall of said elongatedmetal duct which exposes a portion of said one edge of said elongatedpartition and also exposes adjacent portions of said elongated cells, acollar surrounding said opening and extending away from said one wall ofsaid elongated metal duct, said collar coacting with said opening todefine a potential passage which has portions thereof located withinsaid adjacent portions of said elongated cells and which extends throughsaid collar, a barrier which is disposed within said passage and whichoccupies at least a part of the cross section of said passage and whichcoacts with said elongated partition within said elongated metal duct toisolate one of said elongated cells from the other of said elongatedcells, said barrier also effectively blocking access from the upper endof said collar to that portion of said potential passage which islocated within one of said elongated cells, whereby said barriereffectively prevents access to said one of said elongated cells from apoint above the upper end of said collar to a point within said one ofsaid elongated cells, said barrier being removable from said passagewithout any fracturing of the wall of said collar and being bodily andcleanly removable from said passage to free said cross section of saidpassage from all obstructions, and thereby provide full and unobstructedaccess to said adjacent portions of said elongated cell via said collar,said one wall of said elongated metal duct having an upwardly-inclinedflange that surrounds said opening and that extends outwardly from saidone wall of said elongated metal duct and away from said elongatedpartition, said collar having a downwardly-inclined flange at that endthereof which is adjacent said one wall of said elongated metal duct,said downwardly-inclined flange on said collar abutting saidupwardly-inclined flange on said one wall of said elongated metal duct,said downwardly-inclined flange on said collar having two spaced-apartslots therein, and a locking element extending through said spaced-apartslots in said downwardly-inclined flange on said collar and extendingoutwardly from said collar to be embedded within said portion of saidbuilding to prevent peripheral shifting of said collar relative to saidportion of said building or said one wall of said elongated metal duct.9. An enclosure, for electrical conductors, which can be embedded withina portion of a building and which comprises an elongated metal duct, anelongated partition within said elongated metal duct which subdividesthe interior of said elongated metal duct into a plurality of elongatedcells, said elongated partition being angularly disPlaced from the planeof one wall of said elongated metal duct and having one edge thereofadjacent to said one wall, an opening in said one wall of said elongatedmetal duct which exposes a portion of said one edge of said elongatedpartition and also exposes adjacent portions of said elongated cells, acollar surrounding said opening and extending away from said one wall ofsaid elongated metal duct, said collar coacting with said opening todefine a potential passage which has portions thereof located withinsaid adjacent portions of said elongated cells and which extends throughsaid collar, a barrier which is disposed within said passage and whichoccupies at least a part of the cross section of said passage and whichcoacts with said elongated partition within said elongated metal duct toisolate one of said elongated cells from the other of said elongatedcells, said barrier also effectively blocking access from the upper endof said collar to that portion of said potential passage which islocated within one of said elongated cells, whereby said barriereffectively prevents access to said one of said elongated cells from apoint above the upper end of said collar to a point within said one ofsaid elongated cells, said barrier being removable from said passagewithout any fracturing of the wall of said collar and being bodily andcleanly removable from said passage to free said cross section of saidpassage from all obstructions, and thereby provide full and unobstructedaccess to said adjacent portions of said elongated cells via saidcollar, said one wall of said elongated metal duct having anupwardly-inclined flange that surrounds said opening and that extendsoutwardly from said one wall of said elongated metal duct and away fromsaid elongated partition, said collar having a downwardly-inclinedflange at that end thereof which is adjacent said one wall of saidelongated metal duct, said downwardly-inclined flange on said collarabutting said upwardly-inclined flange on said one wall of saidelongated metal duct, said downwardly-inclined flange on said collarhaving two spaced-apart slots therein, a locking element extendingthrough said spaced-apart slots in said downwardly-inclined flange onsaid collar and extending outwardly from said collar to be embeddedwithin said portion of said building to prevent peripheral shifting ofsaid collar relative to said portion of said building or said one wallof said elongated metal duct, and said barrier being part of saidlocking element but being capable of being broken away from said lockingelement to free said cross section of said passage from allobstructions.
 10. An enclosure, for electrical conductors, which can beembedded within a portion of a building and which comprises an elongatedmetal duct, an elongated partition within said elongated metal ductwhich subdivides the interior of said elongated metal duct into aplurality of elongated cells, said elongated partition being angularlydisplaced from the plane of one wall of said elongated metal duct andhaving one edge thereof adjacent to said one wall, an opening in saidone wall of said elongated metal duct which exposes a portion of saidone edge of said elongated partition and also exposes adjacent portionsof said elongated cells, a collar surrounding said opening and extendingaway from said one wall of said elongated metal duct, said collarcoacting with said opening to define a potential passage which hasportions thereof located within said adjacent portions of said elongatedcells and which extends through said collar, a barrier which is disposedwithin said passage and which occupies at least a part of the crosssection of said passage and which coacts with said elongated partitionwithin said elongated metal duct to isolate one of said elongated cellsfrom the other of said elongated cells, said barrier also effectivelyblocking access from the upper end of said collar to that portion ofsaid potential passage which is located within one of saiD elongatedcells, whereby said barrier effectively prevents access to said one ofsaid elongated cells from a point above the upper end of said collar toa point within said one of said elongated cells, said barrier beingremovable from said passage without any fracturing of the wall of saidcollar and being bodily and cleanly removable from said passage to freesaid cross section of said passage from all obstructions, and therebyprovide full and unobstructed access to said adjacent portions of saidelongated cells via said collar, said one wall of said elongated metalduct having an upwardly-inclined flange that surrounds said opening andthat extends outwardly from said one wall of said elongated metal ductand away from said elongated partition, said collar having adownwardly-inclined flange at that end thereof which is adjacent saidone wall of said elongated metal duct, said downwardly-inclined flangeon said collar abutting said upwardly-inclined flange on said one wallof said elongated metal duct, a locking element engaging said collar andextending outwardly from said collar to be embedded within said portionof said building to prevent peripheral shifting of said collar relativeto said portion of said building or said one wall of said elongatedmetal duct, said barrier being part of said locking element, and saidlocking element having readily-frangible portions adjacent said barrierto enable said barrier to be cleanly broken away from said lockingelement to free said central area of said collar from all obstructions.11. An enclosure, for electrical conductors, which can be embeddedwithin a portion of a building and which comprises an elongated metalduct, an elongated partition within said elongated metal duct whichsubdivides the interior of said elongated metal duct into a plurality ofelongated cells, said elongated partition being angularly displaced fromthe plane of one wall of said elongated metal duct and having one edgethereof adjacent to said one wall, an opening in said one wall of saidelongated metal duct which exposes a portion of said one edge of saidelongated partition and also exposes adjacent portions of said elongatedcells, a collar surrounding said opening and extending away from saidone wall of said elongated metal duct, said collar coacting with saidopening to define a potential passage which has portions thereof locatedwithin said adjacent portions of said elongated cells and which extendsthrough said collar, a barrier which is disposed within said passage andwhich occupies at least a part of the cross section of said passage andwhich coacts with said elongated partition within said elongated metalduct to isolate one of said elongated cells from the other of saidelongated cells, said barrier also effectively blocking access from theupper end of said collar to that portion of said potential passage whichis located within one of said elongated cells, whereby said barriereffectively prevents access to said one of said elongated cells from apoint above the upper end of said collar to a point within said one ofsaid elongated cells, said barrier being removable from said passagewithout any fracturing of the wall of said collar and being bodily andcleanly removable from said passage to free said cross section of saidpassage from all obstructions, and thereby provide full and unobstructedaccess to said adjacent portions of said elongated cells via saidcollar, said barrier having a portion thereof aligned with andeffectively acting as a continuation of said elongated partition withinsaid elongated metal duct, and said barrier having a second portionthereof which is angularly displaced from the first said portion of saidbarrier and which overlies and effectively closes the exposed portion ofsaid one of said elongated cells.
 12. An enclosure, for electricalconductors, which can be embedded within concrete and which comprises anelongated metal duct, an elongated partition within said elongated metalduct which sUbdivides the interior of said elongated metal duct into aplurality of elongated cells, said elongated partition being angularlydisplaced from the plane of one wall of said elongated metal duct andhaving one edge thereof adjacent to said one wall, and opening in saidone wall of said elongated metal duct which exposes a portion of saidone edge of said elongated partition and also exposes adjacent portionsof said elongated cells, a collar surrounding said opening and extendingaway from said one wall of said elongated metal duct, said collarcoacting with said opening to define a potential passage which hasportions thereof located within said adjacent portions of said elongatedcells and which extends through said collar, a closure removablydisposed within said collar to initially close said collar and therebykeep concrete which is poured around said elongated metal duct andaround said collar from entering said elongated metal duct via saidcollar, said closure being removable to provide access to the interiorof said collar, and a divider on said closure which is removable withsaid closure, said divider coacting with said elongated partition withinsaid elongated metal duct to isolate one of said elongated cells fromthe other of said elongated cells as long as said closure is disposedwithin said collar.
 13. An enclosure, for electrical conductors, whichcan be embedded within a portion of a building and which comprises anelongated metal duct, an elongated partition within said elongated metalduct which subdivides the interior of said elongated metal duct into aplurality of elongated cells, said elongated partition being angularlydisplaced from the plane of one wall of said elongated metal duct andhaving one edge thereof adjacent to said one wall, an opening in saidone wall of said elongated metal duct which exposes a portion of saidone edge of said elongated partition and also exposes adjacent portionsof said elongated cells, a collar surrounding said opening and extendingaway from said one wall of said elongated metal duct, said collarcoacting with said opening to define a potential passage which hasportions thereof located within said adjacent portions of said elongatedcells and which extends through said collar, a divider which is disposedwithin said passage and which occupies at least a part of the crosssection of said passage and which coacts with said elongated partitionwithin said elongated metal duct to isolate one of said elongated cellsfrom the other of said elongated cells, said divider being removablefrom said passage without any fracturing of the wall of said collar andbeing bodily and cleanly removable from said passage to free said crosssection of said passage from all obstructions, and thereby provide fulland unobstructed access to said adjacent portions of said elongatedcells via said collar, said divider having one portion thereof alignedwith and effectively acting as a continuation of said elongatedpartition within said elongated metal duct, further portions of saiddivider underlying said one wall of said elongated metal duct to helpprevent accidental separation of said divider from said one wall of saidelongated metal duct, and still further portions of said dividerextending over and engaging the exposed edge of said elongated partitionwithin said elongated metal duct to additionally help prevent accidentalseparation of said divider from said one wall of said elongated metalduct.
 14. An enclosure, for electrical conductors, which can be embeddedwithin a portion of a building and which comprises an elongated metalduct, an elongated partition within said elongated metal duct whichsubdivides the interior of said elongated metal duct into a plurality ofelongated cells, said elongated partition being angularly displaced fromthe plane of one wall of said elongated metal duct and having one edgethereof adjacent to said one wall, an opening in said one wall of saidelongated metal duct which exposes a portion of said one edge of saidelongated partition and also exposes adjacent portions of said elongatedcells, a collar surrounding said opening and extending away from saidone wall of said elongated metal duct, said collar coacting with saidopening to define a potential passage which has portions thereof locatedwithin said adjacent portions of said elongated cells and which extendsthrough said collar, a divider which is disposed within said passage andwhich occupies at least a part of the cross section of said passage andwhich coacts with said elongated partition within said elongated metalduct to isolate one of said elongated cells from the other of saidelongated cells, said divider being removable from said passage withoutany fracturing of the wall of said collar and being bodily and cleanlyremovable from said passage to free said cross section of said passagefrom all obstructions, and thereby provide full and unobstructed accessto said adjacent portions of said elongated cells via said collar saiddivider having one portion thereof aligned with and effectively actingas a continuation of said elongated partition within said elongatedmetal duct, further portions of said divider underlying said one wall ofsaid elongated metal duct to help prevent accidental separation of saiddivider from said one wall of said elongated metal duct, still furtherportions of said divider extending over and engaging the exposed edge ofsaid elongated partition within said elongated metal duct toadditionally help prevent accidental separation of said divider fromsaid one wall of said elongated metal duct, said further portions ofsaid divider being disposed at one face of said elongated partitionwithin said elongated metal duct, said still further portions of saiddivider being disposed at the opposite face of said elongated partitionwithin said elongated metal duct, and said divider being selectivelysecurable to or removable from said elongated partition within saidelongated metal duct by rotating said divider about said exposed edge ofsaid elongated partition within said elongated metal duct.
 15. Anenclosure, for electrical conductors, which can be embedded withinconcrete and which comprises an elongated metal duct, an elongatedpartition within said elongated metal duct which subdivides the interiorof said elongated metal duct into a plurality of elongated cells, saidelongated partition being angularly displaced from the plane of one wallof said elongated metal duct and having one edge thereof adjacent tosaid one wall, an opening in said one wall of said elongated metal ductwhich exposes a portion of said one edge of said elongated partition andalso exposes adjacent portions of said elongated cells, a collarsurrounding said opening and extending away from said one wall, anupwardly-inclined flange that surrounds said opening and that extendsoutwardly from said one wall of said elongated metal duct and away fromsaid elongated partition, that end of said collar which is adjacent saidone wall of said elongated metal duct having a slot therein, and alocking element which has a portion thereof extending through andprojecting laterally outwardly beyond said slot in said end of saidcollar and overlying said one wall of said elongated metal duct, saidlocking element having said portion thereof adapted to be exposed to andadapted to be embedded by said concrete to prevent shifting of saidlocking element relative to said collar and to prevent rotation of saidcollar relative to said elongated metal duct after said concrete hasbeen placed and permitted to set.
 16. An enclosure, for electricalconductors, which can be embedded within concrete and which comprises anelongated metal duct, an elongated partition within said elongated metalduct which subdivides the interior of said elongated metal duct into aplurality of elongated cells, said elongated partition being angularlydisplaced from the plane of one wall of said elongated metal duct andhaving one edge tHereof adjacent to said one wall, an opening in saidone wall of said elongated metal duct which exposes a portion of saidone edge of said elongated partition and also exposes adjacent portionsof said elongated cells, a collar surrounding said opening and extendingaway from said one wall, an upwardly-inclined flange that surrounds saidopening and that extends outwardly from said one wall of said elongatedmetal duct and away from said elongated partition, a downwardly-inclinedflange at that end of said collar which is adjacent said one wall ofsaid elongated metal duct, a locking element which engages said collarand overlies said one wall of said elongated metal duct, said lockingelement having a portion thereof which is exposed to and which will beembedded by said concrete to prevent shifting of said locking elementrelative to said collar and also to prevent peripheral shifting of saidcollar relative to said concrete after said concrete has been placed andpermitted to set, said downwardly-inclined flange on said end of saidcollar having a surface thereon which is adjacent a surface on saidlocking member, one of said surfaces having a slot therein to permitsaid locking member to extend both inwardly and outwardly of saiddownwardly-inclined flange on said collar, said upwardly-inclined flangeon said one wall of said elongated metal duct having a further surfacethereon which is adjacent a further surface on said locking member, oneof said further surfaces having a slot therein to permit said lockingmember to extend both inwardly and outwardly of said upwardly-inclinedflange on said one wall of said elongated metal duct, said surface onsaid downwardly-inclined flange on said collar being in register withsaid further surface on said upwardly-inclined flange on said one wallof said elongated metal duct, and said portion of said locking elementbeing disposed outwardly beyond the first said and said further surfaceson said locking element and also being disposed outwardly beyond saidsurface on said downwardly inclined flange on said collar and saidfurther surface on said upwardly-inclined flange on said one wall ofsaid elongated metal duct.
 17. An enclosure, for electrical conductors,which can be embedded within concrete and which comprises an elongatedmetal duct, an elongated partition within said elongated metal ductwhich subdivides the interior of said elongated metal duct into aplurality of elongated cells, said elongated partition being angularlydisplaced from the plane of one wall of said elongated metal duct andhaving one edge thereof adjacent to said one wall, an opening in saidone wall of said elongated metal duct which exposes a portion of saidone edge of said elongated partition and also exposes adjacent portionsof said elongated cells, a collar surrounding said opening and extendingaway from said one wall, an upwardly-inclined flange that surrounds saidopening and that extends outwardly from said one wall of said elongatedmetal duct and away from said elongated partition, that end of saidcollar which is adjacent said one wall of said elongated metal ducthaving a slot therein, a locking element which has a portion thereofextending through and projecting laterally outwardly beyond said slot insaid end of said one wall of said elongated metal duct, said lockingelement having said portion thereof adapted to be exposed to and adaptedto be embedded by said concrete to prevent shifting of said lockingelement relative to said collar and to prevent rotation of said collarrelative to said elongated metal duct after said concrete has beenplaced and permitted to set, a barrier supported on said lockingelement, and said barrier coacting with said elongated partition toisolate one of said elongated cells from the other of said elongatedcells.
 18. An enclosure, for electrical conductors, which can beembedded within concrete and which comprises an elongated metal duct, anelongated partition within said elongated metal duct whiCh subdividesthe interior of said elongated metal duct into a plurality of elongatedcells, said elongated partition being angularly displaced from the planeof one wall of said elongated metal duct and having one edge thereofadjacent to said one wall, an opening in said one wall of said elongatedmetal duct which exposes a portion of said one edge of said elongatedpartition and also exposes adjacent portions of said elongated cells, acollar surrounding said opening and extending away from said one wall,an upwardly-inclined flange that surrounds said opening and that extendsoutwardly from said one wall of said elongated metal duct and away fromsaid elongated partition, that end of said collar which is adjacent saidone wall of said elongated metal duct having a slot therein, a lockingelement which has a portion thereof extending through and projectinglaterally outwardly beyond said slot in said end of said collar andoverlying said one wall of said elongated metal duct, said lockingelement having said portion thereof adapted to be exposed to and adaptedto be embedded by said concrete to prevent shifting of said lockingelement relative to said collar and to prevent rotation of said collarrelative to said elongated metal duct after said concrete has beenplaced and permitted to set, a barrier supported on said lockingelement, said barrier coacting with said elongated partition to isolateone of said elongated cells from the other of said elongated cells, andsaid barrier being movable away from said elongated partition to provideaccess to said one elongated cell.
 19. An enclosure, for electricalconductors, which can be embedded within concrete and which comprises anelongated metal duct, an elongated partition within said elongated metalduct which subdivides the interior of said elongated metal duct into aplurality of elongated cells, said elongated partition being angularlydisplaced from the plane of one wall of said elongated metal duct andhaving one edge thereof adjacent to said one wall, an opening in saidone wall of said elongated metal duct which exposes a portion of saidone edge of said elongated partition and also exposes adjacent portionsof said elongated cells, a collar surrounding said opening and extendingaway from said one wall, an upwardly-inclined flange that surrounds saidopening and that extends outwardly from said one wall of said elongatedmetal duct and away from said elongated partition, that end of saidcollar which is adjacent said one wall of said elongated metal ducthaving a slot therein, a locking element which has a portion thereofextending through and projecting laterally outwardly beyond said slot insaid end of said collar and overlying said one wall of said elongatedmetal duct, said locking element having said portion thereof adapted tobe exposed to and adapted to be embedded by said concrete to preventshifting of said locking element relative to said collar and to preventrotation of said collar relative to said elongated metal duct after saidconcrete has been placed and permitted to set, a barrier which is partof said locking member, said barrier coacting with said elongatedpartition to isolate one of said elongated cells from the other of saidelongated cells, said locking member having readily-frangible portionsadjacent said barrier, and said readily-frangible portions of saidlocking member being capable of being broken to separate said barrierfrom said locking member to provide access to said one elongated cell.20. An enclosure, for electrical conductors, which can be embeddedwithin a portion of a building and which comprises an elongated metalduct, an elongated partition within said elongated metal duct whichsubdivides the interior of said elongated metal duct into a plurality ofelongated cells, said elongated partition being angularly displaced fromthe plane of said elongated metal duct and having one edge thereofadjacent to said one wall, an opening in said one wall of said elongatedmetal duct whIch exposes a portion of said one edge of said elongatedpartition and also exposes adjacent portions of said elongated cells, acollar surrounding said opening and extending away from said one wall,said collar coacting with said opening to define a potential passagewhich has portions thereof located within said adjacent portions of saidelongated cells and which extends through said collar, and a barrierwhich is disposed within said passage and which occupies at least a partof the cross-section of said passage and which coacts with saidelongated partition within said elongated metal duct to isolate one ofsaid elongated cells from the other of said elongated cells, saidbarrier effectively blocking access from the upper end of said collar tothat portion of said potential passage which is located within one ofsaid elongated cells, whereby said barrier effectively prevents accessto said one of said elongated cells from a point above the upper end ofsaid collar to a point within said one of said elongated cells, saidbarrier and said elongated partition having interacting surfaces thereonwhich enable said barrier to be supported by said elongated partition.21. An enclosure for electrical conductors as claimed in claim 20wherein said barrier is removable from said elongated partition withoutany injury to or impairment of said collar or of said elongatedpartition, and wherein said barrier is removable from said elongatedpartition and can be withdrawn through the upper end of said collar tofree said cross section of said passage from all obstructions, andthereby provide full and unobstructed access to said adjacent portionsof said elongated cells via said collar.
 22. An enclosure, forelectrical conductors, which can be embedded within a portion of abuilding and which comprises an elongated metal duct, an elongatedpartition within said elongated metal duct which subdivides the interiorof said elongated metal duct into a plurality of elongated cells, saidelongated partition being angularly displaced from the plane of one wallof said elongated metal duct and having one edge thereof adjacent tosaid one wall, an opening in said one wall of said elongated metal ductwhich exposes a portion of said one edge of said elongated partition andalso exposes adjacent portions of said elongated cells, a collarsurrounding said opening and extending away from said one wall, saidcollar coacting with said opening to define a potential passage whichhas portions thereof located within said adjacent portions of saidelongated cells and which extends through said collar, a barrier whichis disposed within said passage and which occupies at least a part ofthe cross section of said passage and which coacts with said elongatedpartition within said elongated metal duct to isolate one of saidelongated cells from the other of said elongated cells, said barrierbeing supported by said elongated partition, said barrier having aportion which engages and grips one side of said elongated partition,and said barrier having a further portion which engages and grips theopposite side of said elongated partition.
 23. An enclosure, forelectrical conductors, which can be embedded within a portion of abuilding and which comprises an elongated metal duct, an elongatedpartition within said elongated metal duct which subdivides the interiorof said elongated metal duct into a plurality of elongated cells, saidelongated partition being angularly displaced from the plane of one wallof said elongated metal duct and having one edge thereof adjacent tosaid one wall, an opening in said one wall of said elongated metal ductwhich exposes a portion of said one edge of said elongated partition andalso exposes adjacent portions of said elongated cells, a collarsurrounding said opening and extending away from said one wall, saidcollar coacting with said opening to define a potential passage whichhas portions thereof located within said adjacent portions of saidelongated cells and whIch extends through said collar, a divider whichis disposed within said passage and which occupies at least a part ofthe cross section of said passage and which coacts with said elongatedpartition within said elongated metal duct to isolate one of saidelongated cells from the other of said elongated cells, said divider andsaid elongated partition having interacting surfaces thereon whichenable said divider to be supported by said elongated partition, andsaid divider having portions which underlie said one wall of saidelongated metal duct to keep said divider from being accidentallyseparated from said elongated partition.
 24. An enclosure, forelectrical conductors, which can be embedded within a portion of abuilding and which comprises an elongated metal duct, an elongatedpartition within said elongated metal duct which subdivides the interiorof said elongated metal duct into a plurality of elongated cells, saidelongated partition being angularly displaced from the plane of one wallof said elongated metal duct and having one edge thereof adjacent tosaid one wall, an opening in said one wall of said elongated metal ductwhich exposes a portion of said one edge of said elongated partition andalso exposes adjacent portions of said elongated cells, a collarsurrounding said opening and extending away from said one wall, saidcollar coacting with said opening to define a potential passage whichhas portions thereof located within said adjacent portions of saidelongated cells and which extends through said collar, a barrier whichis disposed within said passage and which occupies at least a part ofthe cross section of said passage and which coacts with said elongatedpartition within said elongated metal duct to isolate one of saidelongated cells from the other of said elongated cells, said barrierbeing supported by said elongated partition, said barrier having oneportion thereof aligned with and effectively acting as a continuation ofsaid elongated partition within said elongated metal duct, and saidbarrier having a second portion thereof which is angularly displacedfrom the first said portion of said barrier and which overlies andeffectively closes the exposed portion of said one of said elongatedcells.
 25. An enclosure, for electrical conductors, which can beembedded within a portion of a building and which comprises an elongatedmetal duct, an opening in one wall of said elongated metal duct, acollar surrounding said opening and extending away from said one wall ofsaid elongated metal duct, an ear at the interior of said collar, anopening in the wall of said collar which is adjacent said ear and whichhas essentially the same configuration as said ear, said ear and saidopening being adjacent that end of said collar which extends away fromsaid one wall of said elongated metal duct, and a cup-shaped closurewhich has a generally-cylindrical portion and a web-like portion, saidcup-shaped closure being disposed within said end of said collar whichextends away from said one wall of said elongated metal duct, saidweb-like portion of said cup-shaped closure being adjacent said ear andbeing limited against movement inwardly of said collar by said ear, saidgenerally-cylindrical portion of said cup-shaped closure being adjacentand effectively closing said opening in said wall of said collar,whereby said cup-shaped closure can effectively keep concrete which ispoured around said elongated metal duct and around said collar fromentering said elongated metal duct via said collar.
 26. An enclosure forelectrical conductors as claimed in claim 25 wherein said cup-shapedclosure is removable from said end of said collar which extends awayfrom said one wall of said elongated metal duct to provide access to theinterior of said collar and also to provide access to said ear.
 27. Anenclosure, for electrical conductors, which can be embedded within aportion of a building and which comprises an elongated metal duct, anopening in one wall of saId elongated metal duct, a collar surroundingsaid opening and extending away from said one wall of said elongatedmetal duct, an ear at the interior of said collar which extends inwardlyof said collar, said ear having an opening therein which is generallyparallel to the axis of said collar and which has a portion thereofimmediately adjacent the inner surface of said collar, a support for anelectrical fitting which is securable to said collar by a screwextending through said opening in said ear, the thread of said screwbiting into that portion of said inner surface of said collar which isadjacent said opening in said ear as said screw passes through said earto secure said support in assembled relation with said collar, thebiting of said thread of said screw into said portion of said innersurface of said collar providing effective electrical grounding of saidsupport to said collar.
 28. An enclosure, for electrical conductors,which can be embedded within a portion of a building and which comprisesan elongated metal duct, an elongated partition within said elongatedmetal duct which subdivides the interior of said elongated metal ductinto a plurality of elongated cells, said elongated partition beingangularly displaced from the plane of one wall of said elongated metalduct and having one edge thereof adjacent to said one wall, an openingin said one wall of said elongated metal duct which exposes a portion ofsaid one edge of said elongated partition and also exposes adjacentportions of said elongated cells, a collar surrounding said opening andextending away from said one wall of said elongated metal duct, saidcollar coacting with said opening to define a potential passage whichhas portions thereof located within said adjacent portions of saidelongated cells and which extends through said collar, a support for anelectrical fitting which is securable to said collar, and a dividerwhich is carried by said support and which extends downwardly throughsaid collar to a point adjacent said elongated partition within saidelongated metal duct, said divider having a fixed portion which is heldstationary relative to said support, said divider having a slidableportion which is movable relative to said stationary portion of saiddivider and relative to said support and said collar and said elongatedpartition within said elongated metal duct, said stationary portion ofsaid divider being secured to said support and said support beingsecured to said collar so said slidable portion of said divider isaligned with and can effectively act as a continuation of said elongatedpartition within said elongated metal duct, said divider having meanssecuring said slidable portion of said divider to said stationaryportion of said divider but permitting said slidable portion of saiddivider to be moved toward and to engage said elongated partition withinsaid elongated metal duct, said divider being adapted to accommodatevariations in the distance between said collar and said support whichare caused by different thicknesses of said portion of said building.29. An enclosure for electrical conductors as claimed in claim 28wherein said stationary portion of said divider has laterally-extendingareas thereof telescoped into and tightly held by slots in the walls ofsaid support.
 30. An enclosure for electrical conductors as claimed inclaim 28 wherein said means renders the engagement between said slidableportion of said divider and said stationary portion of said dividerloose enough to permit said slidable portion of said divider to respondto its own weight to move relative to said stationary portion of saiddivider and said collar and said elongated partition within saidelongated metal duct, whereby said slidable portion of said divider willautomatically move into engagement with said elongated partition withinsaid elongated metal duct.
 31. An enclosure, for electrical conductors,which can be embedded within a portion of a building and which comprisesan elongated metal duct, an elongated partition with said elongatedmetal duct which subdivides the interior of said elongated metal ductinto a plurality of elongated cells, said elongated partition beingangularly displaced from the plane of one wall of said elongated metalduct and having one edge thereof adjacent to said one wall, an openingin said one wall of said elongated metal duct which exposes a portion ofsaid one edge of said elongated partition and also exposes adjacentportions of said elongated cells, a collar surrounding said opening andextending away from said one wall of said elongated metal duct, saidcollar coacting with said opening to define a potential passage whichhas portions thereof located within said adjacent portions of saidelongated cells and which extends through said collar, a barrier whichis disposed within said passage and which occupies at least a part ofthe cross section of said passage and which coacts with said elongatedpartition within said elongated metal duct to isolate one of saidelongated cells from the other of said elongated cells, said barrieralso effectively blocking access from the upper end of said collar tothat portion of said potential passage which is located within one ofsaid elongated cells, whereby said barrier effectively prevents accessto said one of said elongated cells from a point above the upper end ofsaid collar to a point within said one of said elongated cells, saidbarrier being removable from said passage without any fracturing of thewall of said collar and being bodily and cleanly removable from saidpassage to free said cross section of said passage from allobstructions, and thereby provide full and unobstructed access to saidadjacent portions of said elongated cells via said collar, said barrierhaving one portion thereof aligned with and effectively acting as acontinuation of said elongated partition within said elongated metalduct, said barrier having a second portion thereof which is angularlydisplaced from the first said portion of said barrier and which overliesand effectively closes the exposed portion of said one of said elongatedcells, readily-frangible means holding said barrier in said passage, andsaid readily-frangible means being capable of being broken to permitremoval of said barrier from said passage.
 32. An enclosure, forelectrical conductors, which can be embedded within a portion of abuilding and which comprises an elongated metal duct, an elongatedpartition within said elongated metal duct which subdivides the interiorof said elongated metal duct into a plurality of elongated cells, saidelongated partition being angularly displaced from the plane of one wallof said elongated metal duct and having one edge thereof adjacent tosaid one wall, an opening in said one wall of said elongated metal ductwhich exposes a portion of said one edge of said elongated partition andalso exposes adjacent portions of said elongated cells, a collarsurrounding said opening and extending away from said one wall of saidelongated metal duct, said collar coacting with said opening to define apotential passage which has portions thereof located within saidadjacent portions of said elongated cells and which extends through saidcollar, that end of said collar which is adjacent said opening in saidone wall of said elongated metal duct having a surface thereon, alocking element which has a surface thereon that is adjacent saidsurface on said end of said collar, one of said surfaces having a slottherein to permit said locking member to extend both inwardly andoutwardly of said one end of said collar, said locking member having aportion thereof that extends outwardly beyond said end of said collarand overlies said one wall of said elongated metal duct, said portion ofsaid locking element being adapted to be engaged by and to be embeddedwithin said portion of said building to help prevent rotation of saidcollar relative to said one wall of said elongated metal duct, and aBarrier which is supported by said locking member and which is disposedwithin said passage and which coacts with said elongated partition toisolate one of said elongated cells from the other of said elongatedcells, said barrier being separable from said locking member to permitremoval of said barrier from said passage.
 33. An enclosure forelectrical conductors as claimed in claim 32 wherein said locking memberhas readily-frangible portions adjacent said barrier, and wherein saidreadily-frangible portions of said locking member can be broken away tofree said barrier from said locking element and thus from said passage.34. An enclosure, for electrical conductors, which can be embeddedwithin a portion of a building and which comprises an elongated metalduct, one wall of said elongated metal duct having an opening therein, acollar surrounding said opening and extending away from said one wall ofsaid elongated metal duct, an upwardly-inclined flange on said one wallof said elongated metal duct that surrounds said opening and thatextends outwardly from said one wall of said elongated metal duct, adownwardly-inclined flange at that end of said collar which is adjacentsaid one wall of said elongated metal duct, and an abutment on saidcollar which is spaced a short distance from said downwardly-inclinedflange on said collar, said downwardly-inclined flange on said collarbeing disposed within and abutting the inner surface of saidupwardly-inclined flange on said one wall of said elongated metal ductto mechanically prevent separating movement of said collar away fromsaid one wall of said elongated metal duct, said abutment on said collarengaging the upper surface of said upwardly-inclined flange on said onewall of said elongated metal duct to mechanically prevent movement ofsaid collar inwardly of said opening in said one wall of said elongatedmetal duct.
 35. An enclosure for electrical conductors as claimed inclaim 34 wherein a locking element engages said collar and said one wallof said elongated metal duct to additionally prevent movement of saidcollar inwardly of said opening in said one wall of said elongated metalduct.
 36. An enclosure, for electrical conductors, which can be embeddedwithin a portion of a building and which comprises an elongated metalduct, an elongated partition within said elongated metal duct whichsubdivides the interior of said elongated metal duct into a plurality ofelongated cells, said elongated partition being angularly displaced fromthe plane of one wall of said elongated metal duct and having one edgethereof adjacent to said one wall, an opening in said one wall of saidelongated metal duct which exposes a portion of said one edge of saidelongated partition and also exposes adjacent portions of said elongatedcells, a collar fixedly secured to said one wall of said elongated metalduct and surrounding said opening and extending away from said one wallof said elongated metal duct, a flush-type support for an electricalfitting which is securable to that end of said collar which extends awayfrom said one wall of said elongated metal duct, removable meansinitially disposed within said collar to coact with said elongatedpartition within said elongated metal duct to provide initial isolationof one of said elongated cells from an adjacent elongated cell, saidremovable means being readily removable from said collar without anyfracturing of the wall of said collar to expose both of said elongatedcells to flush-type support, said flush-type support being dimensionedto extend laterally outwardly beyond the sides of said collar to overliethose parts of the surface of said portion of said building in whichsaid enclosure is embedded, said collar having the central portions ofthe middle and of said end thereof effectively free of permanentobstructions so the removal of said removable means will enable saidmiddle and said end of said collar to accommodate said electricalfitting, said flush-type support being adapted to hold a portion of saidelectrical fitting within said end of said collar, and elongatedfasteners adapted to extend from said flush-type support to said collarto hold said flush-type support against movement relative to said collaralthough said portion of said building spaces said flush-type supportoutwardly from said end of said collar.
 37. An enclosure, for electricalconductors, which can be embedded within a portion of a building andwhich comprises an elongated metal duct, an elongated partition withinsaid elongated metal duct which subdivides the interior of saidelongated metal duct into a plurality of elongated cells, said elongatedpartition being angularly displaced from the plane of one wall of saidelongated metal duct and having one edge thereof adjacent to said onewall, an opening in said one wall of said elongated metal duct whichexposes a portion of said one edge of said elongated partition and alsoexposes adjacent portions of said elongated cells, a collar fixedlysecured to said one wall of said elongated metal duct and surroundingsaid opening and extending away from said one wall of said elongatedmetal duct, a flush-type support for an electrical fitting which issecurable to that end of said collar which extends away from said onewall of said elongated metal duct, said collar having the centralportions of the middle and of said end thereof effectively free ofpermanent obstructions to enable said middle and said end of said collarto accommodate said electrical fitting, said flush-type support beingadapted to hold a portion of said electrical fitting within said end ofsaid collar but out of engagement with said elongated partition withinsaid elongated metal duct, and isolating means adjacent that end of saidcollar which is adjacent said one wall of said elongated metal duct,said isolating means being spaced from and not interfering with saidflush-type support or said electrical fitting, said isolating meanseffectively coacting with said elongated partition within said elongatedmetal duct to isolate one of said elongated cells within said elongatedmetal duct from an adjacent elongated cell within said elongated metalduct.
 38. An enclosure, for electrical conductors, which can be embeddedwithin a portion of a building and which comprises an elongated metalduct, an elongated partition within said elongated metal duct whichsubdivides the interior of said elongated metal duct into a plurality ofelongated cells, said elongated partition being angularly displaced fromthe plane of one wall of said elongated metal duct and having one edgethereof adjacent to said one wall, an opening in said one wall of saidelongated metal duct which exposes a portion of said one edge of saidelongated partition and also exposes adjacent portions of said elongatedcells, a collar surrounding said opening and extending away from saidone wall of said elongated metal duct, said collar coacting with saidopening to define a potential passage which has portions thereof locatedwithin said adjacent portions of said elongated cells and which extendsthrough said collar, a barrier which is disposed within said passage andwhich occupies at least a part of the cross section of said passage andwhich coacts with said elongated partition within said elongated metalduct to isolate one of said elongated cells from the other of saidelongated cells, said barrier also effectively blocking access from theupper end of said collar to that portion of said potential passage whichis located within one of said elongated cells, whereby said barriereffectively prevents access to said one of said elongated cells from apoint above the upper end of said collar to a point within said one ofsaid elongated cells, said barrier being removable from said passagewithout any fracturing of the wall of said collar and being bodily andcleanly removable from said passage to free said cross section of saidpassage from all obstructions, and thereby provide full and unobstRuctedaccess to said adjacent portions of said elongated cells via saidcollar, said barrier having a portion thereof aligned with andeffectively acting as a continuation of said elongated partition withinsaid elongated metal duct, said barrier having a second portion thereofwhich is angularly displaced from the first said portion of said barrierand which overlies and effectively closes the exposed portion of saidone of said elongated cells, said second portion of said barrier havinga part thereof which is spaced from the adjacent portion of the interiorof said collar by a distance which enables the blade of a screwdriver tobe inserted between said part of said second portion of said barrier andsaid adjacent portion of said interior of said collar, and said secondportion of said barrier inclining upwardly from said first said portionof said barrier toward said adjacent portion of said interior of saidcollar, whereby twisting of said blade of said screwdriver can tilt saidsecond portion of said barrier upwardly toward the upper end of saidcollar.